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Proofgold Proof

pf
Let x0 of type ο be given.
Let x1 of type ο be given.
Let x2 of type ο be given.
Assume H0: and (and x0 x1) x2.
Let x3 of type ο be given.
Assume H1: x0x1x2x3.
Apply H0 with x3.
Assume H2: and x0 x1.
Assume H3: x2.
Apply H2 with x3.
Assume H4: x0.
Assume H5: x1.
Apply H1 leaving 3 subgoals.
The subproof is completed by applying H4.
The subproof is completed by applying H5.
The subproof is completed by applying H3.