Inverses.dfy(70,0): Error BP5003: A postcondition might not hold on this return path.
Inverses.dfy(69,10): Related location: This is the postcondition that might not hold.
Inverses.dfy(69,66): Related location
Execution trace:
    (0,0): anon0
    (0,0): anon6_Else
Inverses.dfy(83,0): Error BP5003: A postcondition might not hold on this return path.
Inverses.dfy(82,10): Related location: This is the postcondition that might not hold.
Inverses.dfy(82,66): Related location
Execution trace:
    (0,0): anon0
    (0,0): anon9_Else

Dafny program verifier finished with 17 verified, 2 errors