分枝法 branching process
互联网
AA×aa bb×Bb Cc×Cc
× 1CC=1AaBbCC
1Bb × 2Cc=2AaBbCc
× × 1cc=1AaBbcc
Aa
× × 1CC=1AabbCC
1bb × 2Cc=2AabbCc
× 1cc=1Aabbcc
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