# Neurological, Musculoskeletal, Dermatologic & Sensory Combining Forms (encephal/o, oste/o, ophthalm/o)

> 32 review cards on neurological, cranial, axial and appendicular skeletal, articular, muscular, dermatologic, ophthalmic, and otolaryngologic Greek/Latin combining forms, primary and secondary skin lesions, ocular and auditory disorders, and look-alike root distinctions.

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- **Level:** advanced
- **Languages:** en → en
- **Total Cards:** 32

## Flashcards (32 Cards)

| # | Front (Term / Prompt) | Back (Definition / Answer) | Example | Multiple-Choice Options |
| :--- | :--- | :--- | :--- | :--- |
| 1 | Distinguish between the look-alike roots 'arteri/o vs. ather/o vs. arthr/o' and 'ureter/o vs. urethr/o vs. uter/o'. | 'arteri/o' = artery, 'ather/o' = fatty plaque/gruel, and 'arthr/o' = joint; 'ureter/o' = ureter (paired tubes from kidneys to bladder), 'urethr/o' = urethra (single tube from bladder to exterior), and 'uter/o' = uterus (womb). |  |  |
| 2 | What do the auditory and vestibular terms 'Presbycusis', 'Tinnitus', 'Vertigo', 'Otosclerosis', 'Cholesteatoma', and 'Ménière Disease' mean? | 'Presbycusis' (presby/o = old age + -cusis = hearing) = age-related symmetric high-frequency sensorineural hearing loss; 'Tinnitus' = perception of ringing, buzzing, or roaring in the ears without an external stimulus; 'Vertigo' = false rotational sensation that the room or patient is spinning; 'Otosclerosis' = abnormal bony remodeling fixing the stapes footplate to the oval window (conductive hearing loss in young adults); 'Cholesteatoma' = destructive, keratinizing squamous epithelial cyst in the middle ear/mastoid that erodes ossicles; 'Ménière disease' = endolymphatic hydrops of the inner ear causing episodic vertigo, low-frequency sensorineural hearing loss, tinnitus, and aural fullness. |  |  |
| 3 | What do the anterior and posterior globe combining forms 'scler/o', 'kerat/o (corne/o)', 'ir/o (irid/o)', 'core/o (cor/o, pupill/o)', 'cycl/o', 'phac/o (phak/o, lent/i)', 'uve/o', 'choroid/o', 'retin/o', and 'vitre/o' mean? | 'scler/o' = white fibrous outer coat of eye (sclera; scleritis); 'kerat/o' and 'corne/o' = transparent anterior cornea (keratitis, keratoplasty = corneal transplant, radial keratotomy); 'ir/o / irid/o' = iris (colored muscular ring; iritis, iridectomy); 'core/o / cor/o / pupill/o' = pupil (anisocoria); 'cycl/o' = ciliary body (cycloplegia = paralysis of accommodation); 'phac/o / phak/o / lent/i' = crystalline lens (phacoemulsification for cataract extraction, pseudophakia = artificial intraocular lens, aphakia); 'uve/o' = vascular tunic (iris + ciliary body + choroid; uveitis); 'choroid/o' = choroid (vascular middle coat); 'retin/o' = retina; 'vitre/o' = vitreous body/humor (vitrectomy). |  |  |
| 4 | Distinguish between 'Otitis Externa', 'Acute Otitis Media (AOM)', and 'Otitis Media with Effusion (Serous Otitis Media)', and what is a 'Myringotomy with Tympanostomy'? | 'Otitis externa' ('swimmer's ear') = infection of the external auditory canal (pain on tragal/pinna traction, often Pseudomonas); 'Acute otitis media' = bacterial/viral infection of the middle ear cleft with a bulging, erythematous tympanic membrane and fever; 'Otitis media with effusion' = non-purulent fluid collection behind an intact eardrum without acute infection signs; 'Myringotomy with tympanostomy' = surgical incision into the eardrum (myringotomy) with placement of a pressure-equalizing ventilation tube (tympanostomy). |  |  |
| 5 | What do the cutaneous color combining forms 'erythem/o (erythr/o)', 'cyan/o', 'icter/o (xanth/o, cirrh/o, jaund/o)', 'leuk/o (alb/o)', and 'melan/o' signify on physical exam? | 'erythem/o / erythr/o' = redness due to capillary hyperemia (erythema); 'cyan/o' = bluish discoloration of skin/mucosa from increased deoxygenated hemoglobin (> 5 g/dL; cyanosis); 'icter/o' and 'jaund/o' = jaundice (yellow discoloration of skin and sclerae from hyperbilirubinemia; scleral icterus), while 'xanth/o' and 'cirrh/o' = yellow/tawny (xanthoma = lipid deposit, cirrhosis); 'leuk/o / alb/o' = white (vitiligo, albinism, leukoplakia); 'melan/o' = black/dark brown. |  |  |
| 6 | What do the peripheral nervous system combining forms 'neur/o (neur/i)', 'radicul/o (rhiz/o)', 'gangli/o (ganglion/o)', 'plex/o', and 'gli/o' mean? | 'neur/o' and 'neur/i' = nerve (neuropathy, neuralgia, neurilemoma); 'radicul/o' (Latin) and 'rhiz/o' (Greek) = spinal nerve root (radiculopathy = pinched/inflamed nerve root causing dermatomal pain/weakness; rhizotomy = surgical severance of a nerve root); 'gangli/o' and 'ganglion/o' = ganglion (cluster of peripheral neuronal cell bodies); 'plex/o' = braided network of nerves or vessels (brachial plexus); 'gli/o' = neuroglia/supporting CNS glue cells (glioblastoma, astrocytoma, oligodendroglioma). |  |  |
| 7 | What do the spinal curvature terms 'Kyphosis', 'Lordosis', and 'Scoliosis' mean? | 'Kyphosis' (kyph/o = humpback) = exaggerated posterior convexity of the thoracic spine ('dowager's hump'); 'Lordosis' (lord/o = bending backward/swayback) = exaggerated anterior convexity of the lumbar or cervical spine; 'Scoliosis' (scoli/o = crooked/curved) = abnormal lateral curvature and rotational deformity of the vertebral column in the coronal plane. |  |  |
| 8 | Distinguish the refractive errors and ophthalmic conditions: 'Myopia', 'Hyperopia', 'Presbyopia', 'Astigmatism', 'Strabismus', 'Amblyopia', and 'Nystagmus'. | 'Myopia' (nearsightedness) = light focuses in front of the retina (corrected with concave minus lens); 'Hyperopia' (farsightedness) = light focuses behind the retina (convex plus lens); 'Presbyopia' (presby/o = old age) = age-related loss of lens elasticity and near accommodation; 'Astigmatism' = asymmetric corneal curvature preventing a single focal point; 'Strabismus' = ocular misalignment (esotropia = inward turn, exotropia = outward turn); 'Amblyopia' ('lazy eye') = cortical suppression of vision from a misaligned or deprived eye during childhood; 'Nystagmus' = involuntary rhythmic oscillatory eye movements. |  |  |
| 9 | Distinguish between the look-alike roots 'hidr/o vs. hydr/o', 'nephr/o vs. necr/o', 'mast/o vs. mastoid/o', and 'stomat/o vs. somat/o'. | 'hidr/o' = sweat (hyperhidrosis) vs. 'hydr/o' = water/fluid (hydronephrosis, hydrocephalus); 'nephr/o' = kidney (nephritis) vs. 'necr/o' = death/necrosis (necrotizing); 'mast/o' = breast (mastectomy) vs. 'mastoid/o' = mastoid process of temporal bone (mastoiditis); 'stomat/o' = mouth/stoma (stomatitis) vs. 'somat/o' = body (somatic, psychosomatic). |  |  |
| 10 | What do the muscle, tendon, ligament, and fascia combining forms 'my/o (muscul/o, myos/o)', 'rhabdomy/o', 'leiomy/o', 'ten/o (tend/o, tendin/o)', 'syndesm/o (ligament/o)', and 'fasci/o (aponeur/o)' mean? | 'my/o', 'myos/o', and 'muscul/o' = muscle (myositis, polymyositis, Electromyography = EMG); 'rhabdomy/o' = striated/skeletal muscle (rhabdomyolysis = skeletal muscle breakdown releasing myoglobin; rhabdomyosarcoma); 'leiomy/o' = smooth/visceral muscle (leiomyoma = uterine fibroid); 'ten/o / tend/o / tendin/o' = tendon (connects muscle to bone; tendinitis, tenosynovitis, tenorrhaphy); 'syndesm/o / ligament/o' = ligament (connects bone to bone); 'fasci/o' = fibrous membrane covering muscle (plantar fasciitis, fasciotomy) and 'aponeur/o' = aponeurosis (flat tendon sheet). |  |  |
| 11 | What do the pelvic and appendicular bone combining forms 'pelv/i (pelv/o)', 'ili/o', 'ischi/o', 'pub/o', 'acetabul/o', 'femor/o', 'patell/o', 'tibi/o', 'fibul/o (perone/o)', 'calcane/o', 'tars/o', 'carp/o', 'metacarp/o', and 'phalang/o' mean? | 'pelv/i / pelv/o' = pelvis; 'ili/o' = ilium (superior hip bone); 'ischi/o' = ischium (posterior/inferior sitting hip bone); 'pub/o' = pubis (anterior hip bone); 'acetabul/o' = acetabulum (hip socket); 'femor/o' = femur (thigh bone); 'patell/o' = patella (kneecap); 'tibi/o' = tibia (medial shin bone); 'fibul/o / perone/o' = fibula (lateral lower leg bone); 'calcane/o' = calcaneus (heel bone); 'tars/o' = ankle bones vs. 'carp/o' = wrist bones; 'metacarp/o' = metacarpals (palm bones); 'phalang/o' = finger or toe bones. |  |  |
| 12 | What do the dermatologic combining forms 'cutane/o (derm/o, dermat/o)', 'kerat/o', 'melan/o', 'seb/o', 'hidr/o (sudor/i)', 'pil/o (trich/o)', 'onych/o (ungu/o)', and 'adip/o (lip/o, steat/o)' mean? | 'cutane/o' (Latin) and 'derm/o / dermat/o' (Greek) = skin; 'kerat/o' = horny tissue/keratin OR cornea (seborrheic keratosis, actinic keratosis); 'melan/o' = black/melanin pigment (melanocyte, melanoma); 'seb/o' = sebum/sebaceous oil gland (seborrhea); 'hidr/o' (Greek, with one 'd', not hydr/o = water) and 'sudor/i' (Latin) = sweat or sweat gland (hyperhidrosis, anhidrosis, hidradenitis); 'pil/o' and 'trich/o' = hair (pilonidal, trichotillomania = compulsive hair pulling); 'onych/o' and 'ungu/o' = fingernail/toenail (onychomycosis = fungal nail infection, subungual); 'adip/o / lip/o / steat/o' = fat or sebum. |  |  |
| 13 | Distinguish between the look-alike roots 'py/o vs. pyel/o vs. pyr/o vs. pylor/o'. | 'py/o' = pus (pyuria, pyoderma, empyema); 'pyel/o' = renal pelvis (pyelonephritis); 'pyr/o' (pyret/o) = fever, fire, or heat (pyrogen, antipyretic, pyrosis = heartburn); 'pylor/o' = pylorus / distal gastric sphincter (pyloric stenosis). |  |  |
| 14 | What do the joint, cartilage, and connective tissue combining forms 'arthr/o (articul/o)', 'chondr/o (cartilagin/o)', 'synovi/o', 'burs/o', 'menisc/o', and 'ankyl/o' mean? | 'arthr/o' (Greek) and 'articul/o' (Latin) = joint (arthroscopy, arthralgia, arthritis); 'chondr/o' and 'cartilagin/o' = cartilage (chondromalacia, osteochondroma, achondroplasia); 'synovi/o' = synovial membrane or fluid lining diarthrodial joints; 'burs/o' = bursa (fluid-filled sac cushioning friction over bony prominences; bursitis); 'menisc/o' = meniscus (crescent-shaped fibrocartilage pad in the knee); 'ankyl/o' = stiffness, fusion, or immobility of a joint. |  |  |
| 15 | Distinguish between the look-alike roots 'my/o vs. myel/o vs. myring/o vs. myc/o vs. myx/o'. | 'my/o' = muscle (myocardium); 'myel/o' = spinal cord or bone marrow (myelopathy, myeloma); 'myring/o' = tympanic membrane / eardrum (myringotomy); 'myc/o' = fungus (onychomycosis, mycology); 'myx/o' = mucus (myxedema, atrial myxoma). |  |  |
| 16 | Distinguish between 'Mydriasis' and 'Miosis', and between a 'Mydriatic' and a 'Cycloplegic' ophthalmic medication. | 'Mydriasis' = dilation of the pupil (sympathetic alpha-1 stimulation of dilator pupillae or parasympathetic M3 blockade); 'Miosis' = constriction of the pupil (parasympathetic M3 stimulation of sphincter pupillae or opioids/organophosphates); a 'Mydriatic' drug dilates the pupil (e.g., phenylephrine), whereas a 'Cycloplegic' drug (antimuscarinic, e.g., atropine, tropicamide, cyclopentolate) paralyzes the ciliary muscle (blocking accommodation) IN ADDITION to causing mydriasis. |  |  |
| 17 | Distinguish the primary flat versus elevated solid skin lesions: 'Macule vs. Patch' and 'Papule vs. Plaque vs. Nodule vs. Wheal'. | 'Macule' = flat, non-palpable circumscribed color change < 1 cm (freckle, petechia), whereas 'Patch' is flat and >= 1 cm (vitiligo); 'Papule' = elevated, solid palpable lesion < 1 cm (wart, mole), whereas 'Plaque' is a flat-topped elevated plateau >= 1 cm (psoriasis); 'Nodule' = deeper, firm solid lesion >= 1 cm extending into dermis/subcutis; 'Wheal' (hive) = transient, pruritic edematous dermal papule/plaque (urticaria). |  |  |
| 18 | What do the central nervous system combining forms 'encephal/o', 'cerebr/o', 'cortic/o', 'thalam/o', 'cerebell/o', 'myel/o', and 'mening/o (meningi/o)' mean? | 'encephal/o' = entire brain (encephalitis, encephalopathy, electroencephalogram); 'cerebr/o' = cerebrum / cerebral hemispheres (cerebrovascular); 'cortic/o' = outer bark/cortex; 'thalam/o' = thalamus; 'cerebell/o' = cerebellum ('little brain'); 'myel/o' = spinal cord (myelitis, myelopathy); 'mening/o / meningi/o' = meninges (dura, arachnoid, pia mater; meningitis, meningioma, meningomyelocele). |  |  |
| 19 | What do the dermatologic terms 'Alopecia', 'Pruritus', 'Urticaria', 'Ecchymosis', 'Diaphoresis', 'Eschar', and 'Keloid' mean? | 'Alopecia' = hair loss or baldness; 'Pruritus' (note spelling: -itus, not -itis!) = itching; 'Urticaria' = hives; 'Ecchymosis' = bruise; 'Diaphoresis' = profuse sweating; 'Eschar' = thick, dry, black necrotic slough/scab (e.g., third-degree burn or cutaneous anthrax); 'Keloid' = exuberant, claw-like overgrowth of dense collagenous scar tissue extending BEYOND the boundaries of the original wound (vs. hypertrophic scar, which stays within wound margins). |  |  |
| 20 | Distinguish between 'Cataract', 'Glaucoma', 'Macular Degeneration', and 'Retinal Detachment' based on their anatomical sites and mechanisms. | 'Cataract' = opacification/clouding of the crystalline lens causing painless glare and blurred vision; 'Glaucoma' = optic neuropathy with cupping of the optic disc and peripheral visual field loss, usually associated with elevated intraocular pressure (impaired aqueous humor drainage through the trabecular meshwork/canal of Schlemm); 'Age-related Macular Degeneration (AMD)' = degeneration of the central macula/fovea causing loss of central visual acuity; 'Retinal detachment' = separation of the neurosensory retina from the underlying retinal pigment epithelium ('curtain coming down' over vision, flashes/photopsia, and floaters). |  |  |
| 21 | Distinguish between 'Osteoporosis', 'Osteomalacia (Rickets)', 'Osteomyelitis', 'Osteonecrosis (Avascular Necrosis)', and 'Osteitis Deformans (Paget Disease)'. | 'Osteoporosis' (-porosis = porous passage) = decreased bone mineral density (normal mineralization ratio, reduced trabecular mass); 'Osteomalacia' (adults) and 'Rickets' (children) = defective mineralization of osteoid matrix due to Vitamin D deficiency (soft bones); 'Osteomyelitis' = bacterial/fungal infection of bone and bone marrow; 'Osteonecrosis' = ischemic death of bone tissue (e.g., femoral head from corticosteroids/sickle cell); 'Paget disease' = disordered, accelerated osteoclast bone resorption followed by chaotic osteoblast remodeling. |  |  |
| 22 | What do the external eye and lacrimal combining forms 'ophthalm/o (ocul/o, opt/o)', 'blephar/o (palpebr/o)', 'conjunctiv/o', 'dacry/o (lacrim/o)', and 'dacryocyst/o' mean? | 'ophthalm/o' (Greek) and 'ocul/o' (Latin) = eye (ophthalmologist, oculomotor); 'opt/o' = vision/sight (optometry); 'blephar/o' (Greek) and 'palpebr/o' (Latin) = eyelid (blepharitis, blepharoptosis, blepharoplasty); 'conjunctiv/o' = conjunctiva (mucous membrane lining eyelids and anterior sclera); 'dacry/o' and 'lacrim/o' = tear or tear duct (dacryoadenitis = lacrimal gland inflammation); 'dacryocyst/o' = lacrimal (tear) sac (dacryocystitis, dacryocystorhinostomy). |  |  |
| 23 | Distinguish the higher cortical and motor terms: 'Agnosia', 'Apraxia', 'Ataxia', 'Dysarthria', and 'Aphasia'. | 'Agnosia' (a- = without + -gnosia = knowing) = inability to recognize sensory stimuli (e.g., visual objects, faces, sounds) despite intact primary sensation; 'Apraxia' (-praxia = action) = inability to perform learned purposeful motor tasks despite intact motor strength and comprehension; 'Ataxia' = lack of motor coordination; 'Dysarthria' = slurred/unclear speech articulation due to motor weakness/incoordination of speech muscles; 'Aphasia' = cortical impairment of language comprehension or expression. |  |  |
| 24 | Distinguish between a 'Sprain' and a 'Strain', and between 'Subluxation' and 'Dislocation (Luxation)'. | 'Sprain' = stretching or tearing of a LIGAMENT (fibrous band connecting bone to bone across a joint); 'Strain' = stretching or tearing of a MUSCLE or TENDON (attaching muscle to bone); 'Dislocation (Luxation)' = complete displacement of articular bone surfaces so they are no longer in contact; 'Subluxation' = partial or incomplete dislocation of a joint. |  |  |
| 25 | Distinguish between 'Meningocele', 'Myelomeningocele', 'Encephalocele', and 'Spina Bifida Occulta'. | 'Spina bifida occulta' = failure of vertebral laminae to fuse without herniation of meninges or neural tissue (often marked by a sacral dimple or hair tuft); 'Meningocele' = protrusion of a CSF-filled meningeal sac through a vertebral defect WITHOUT neural tissue inside; 'Myelomeningocele' = protrusion of BOTH the meninges and the spinal cord/nerve roots through a vertebral defect; 'Encephalocele' = herniation of brain tissue and meninges through a congenital skull defect (cranium bifidum). |  |  |
| 26 | What do the cranial and skeletal combining forms 'crani/o', 'oste/o', 'spondyl/o (vertebr/o)', 'cost/o', 'stern/o', 'clavicul/o (cleid/o)', and 'scapul/o' mean? | 'crani/o' = skull/cranium (craniotomy, craniosynostosis); 'oste/o' = bone (osteomyelitis, osteoporosis, osteomalacia); 'spondyl/o' (Greek) and 'vertebr/o' (Latin) = vertebra/spinal column (ankylosing spondylitis, spondylosis); 'cost/o' = rib (costochondritis, subcostal); 'stern/o' = sternum/breastbone (median sternotomy); 'clavicul/o' and 'cleid/o' = clavicle/collarbone (sternocleidomastoid); 'scapul/o' = scapula/shoulder blade. |  |  |
| 27 | Distinguish the eyelid lesions and malpositions: 'Hordeolum (Stye)', 'Chalazion', 'Entropion', 'Ectropion', 'Blepharoptosis', and 'Xanthelasma'. | 'Hordeolum (stye)' = acute, painful bacterial (S. aureus) infection of an eyelash follicle or Zeis/Meibomian gland; 'Chalazion' = chronic, painless lipogranulomatous nodule caused by an obstructed Meibomian oil gland; 'Entropion' = inward turning of the eyelid margin causing eyelashes to rub against the cornea (trichiasis); 'Ectropion' = outward turning/eversion of the lower eyelid margin; 'Blepharoptosis' = drooping of the upper eyelid; 'Xanthelasma' = yellowish cholesterol-filled plaques on the medial eyelids. |  |  |
| 28 | Distinguish between the look-alike roots 'col/o vs. chol/e vs. colp/o' and 'cyst/o vs. cyt/o'. | 'col/o' = colon/large intestine (colectomy), 'chol/e' = bile/gall (cholelithiasis), and 'colp/o' = vagina (colposcopy); 'cyst/o' = urinary bladder or sac (cystoscopy) vs. 'cyt/o' = cell (cytology, leukocyte). |  |  |
| 29 | Distinguish the primary fluid-filled skin lesions: 'Vesicle vs. Bulla' and 'Pustule vs. Cyst', plus secondary lesions 'Erosion vs. Ulcer vs. Fissure'. | 'Vesicle' = circumscribed serous fluid-filled blister < 1 cm (herpes simplex, varicella), whereas 'Bulla' is a fluid-filled blister >= 1 cm (bullous pemphigoid, 2nd-degree burn); 'Pustule' = superficial elevated lesion filled with purulent exudate/pus (acne, impetigo); 'Cyst' = encapsulated sac lined by epithelium containing fluid or semi-solid material; 'Erosion' = partial-thickness loss of epidermis only (heals without scarring), whereas 'Ulcer' = full-thickness loss extending into dermis or deeper (heals with scarring); 'Fissure' = linear crack in skin. |  |  |
| 30 | Why must you check the organ system when interpreting the combining forms 'kerat/o', 'scler/o', 'salping/o', 'cervic/o', 'cyst/o', 'myel/o', and 'phren/o'? | 'kerat/o' = cornea OR epidermis/keratin; 'scler/o' = sclera of eye OR hardening; 'salping/o' = fallopian tube OR Eustachian tube; 'cervic/o' = neck OR uterine cervix; 'cyst/o' = urinary bladder OR any fluid-filled sac; 'myel/o' = bone marrow OR spinal cord; 'phren/o' = diaphragm OR mind. |  |  |
| 31 | Distinguish the three 'spondyl-' spinal conditions: 'Spondylosis', 'Spondylolysis', and 'Spondylolisthesis', plus 'Ankylosing Spondylitis'. | 'Spondylosis' = age-related degenerative osteoarthritis of the intervertebral discs and facet joints; 'Spondylolysis' (-lysis = dissolution/fracture) = stress fracture or defect in the pars interarticularis of the vertebral arch ('Scotty dog collar' on oblique X-ray, typically L5); 'Spondylolisthesis' (-listhesis = slipping) = anterior slippage of one vertebral body over the vertebra below it; 'Ankylosing spondylitis' (ankyl/o = crooked/fused/stiff) = HLA-B27 seronegative inflammatory arthritis causing fusion ('bamboo spine') of the sacroiliac joints and spine. |  |  |
| 32 | What do the otolaryngologic (ear) combining forms 'ot/o (aur/i, auricul/o)', 'myring/o (tympan/o)', 'ossicul/o (malle/o, incud/o, staped/o)', 'salping/o', 'mastoid/o', 'labyrinth/o', 'vestibul/o', and 'cochle/o' mean? | 'ot/o' (Greek) and 'aur/i / auricul/o' (Latin) = ear (otalgia = earache, otorrhea, auricle/pinna); 'myring/o' = tympanic membrane / eardrum specifically (myringotomy, myringoplasty); 'tympan/o' = eardrum OR middle ear cavity (tympanostomy tubes, tympanoplasty); 'ossicul/o' = auditory ossicles ('malle/o' = malleus/hammer, 'incud/o' = incus/anvil, 'staped/o' = stapes/stirrup; stapedectomy for otosclerosis); 'salping/o' = Eustachian (auditory/pharyngotympanic) tube OR fallopian tube; 'mastoid/o' = mastoid air cells of temporal bone (mastoiditis); 'labyrinth/o' = inner ear ('vestibul/o' = vestibule + semicircular canals + 'cochle/o' = cochlea). |  |  |

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