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A Family (Boy (B) (B (B, G), G (B, G)), Girl (G) (B (B, G), G (B, G))),…
A Family
Boy (B)
B
B
G
G
B
G
Girl (G)
B
B
G
G
B
G
BBB
BBG
BGB
BGG
GBB
GBG
GGB
GGG