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Proof step 7 from proof contains-bytearray-04 (conclusion)

⊦ contains(str, mkarraytype(byte_type), ty) ↔ ty = byte_type

User applied rule case distinction

And obtained the following new goals

Proof step 3:
contains(str, mkarraytype(byte_type), ty) ⊦ ty = byte_type
Proof step 6:
ty = byte_type ⊦ contains(str, mkarraytype(byte_type), ty)

Rule argument

[CASEDARG : pos: right 1, ()]

Additional information

[[CONCRETESIMPRULES : ()]]