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Commit 2022-05-22 01:40 d8b6f768

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feat(set_theory/game/birthday): More basic birthdays (#14287)

Estimated changes

Modified src/set_theory/game/birthday.lean

added theorem pgame.birthday_half

added theorem pgame.birthday_star

Modified src/set_theory/ordinal/arithmetic.lean

added theorem ordinal.succ_one