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achar
john hasbrouck van vleck
market
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center
across the country
zip fastener
a dime a dozen
ejection seat
transponder
man-eating shark
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mastered
mastered
/ˈmæstɝd/
adjective
Understood perfectly
(
down pat
,
mastered
,
down
)
understood perfectly
Had his algebra problems down
had his algebra problems down
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