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Commit 2022-03-14 13:59 5242a7fb

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feat(data/list/infix): add lemmas and instances (#12511)

Estimated changes

Modified src/data/list/infix.lean

deleted theorem list.infix.length_le

added theorem list.infix_cons_iff

added theorem list.is_infix.length_le

added theorem list.is_prefix.length_le

added theorem list.is_suffix.length_le

added theorem list.reverse_infix