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B/A [Ratio] is the "Boob to Arm" [ratio] which signifies the relation between the circumference of a girl's arm to the size of her chest and breasts. A large B/A [ratio] is considered highly attractive (i.e. large breasts / small arms), an equal ratio, neutral (small breasts/ small arms or large breasts/ large arms) and a low ratio, unattractive (large arms, small breasts)..
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