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18 certificate
2,4,5-T
2,4-D
.22
24/7
3G
4-F
4-H
401(k)
404
411
4GL
4WD
52-week
64 bit key
8(a) firm
802.11
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a (2)

a


symbol 
Definition:
 
1. physics acceleration

2. first vertical row of chessboard: used to refer to the first vertical row of squares from the left on a chessboard

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