Basic General Knowledge
Primary rainbow is formed when light suffers

no internal refraction
two internal refractions before emerging out of the drop
one internal refractions before emerging out of the drop
either one or two internal refractions before emerging out of the drop

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Basic General Knowledge
The term used in billiards are

target, field, flight, ballsege
auxiliary point system, rabbit punch, break, cut
blank line, break, bolting, cannon, cue, hazard, in-oft
blocking, held ball, holding, jump ball, pivot

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