Let x0 of type ο be given.
Let x1 of type ο be given.
Let x2 of type ο be given.
Let x3 of type ο be given.
Let x4 of type ο be given.
Let x5 of type ο be given.
Let x6 of type ο be given.
Assume H1: x0 ⟶ x1 ⟶ x2 ⟶ x3 ⟶ x4 ⟶ x5 ⟶ x6.
Apply H0 with
x6.
Assume H3: x5.
Apply and5E with
x0,
x1,
x2,
x3,
x4,
x6 leaving 2 subgoals.
The subproof is completed by applying H2.
Assume H4: x0.
Assume H5: x1.
Assume H6: x2.
Assume H7: x3.
Assume H8: x4.
Apply H1 leaving 6 subgoals.
The subproof is completed by applying H4.
The subproof is completed by applying H5.
The subproof is completed by applying H6.
The subproof is completed by applying H7.
The subproof is completed by applying H8.
The subproof is completed by applying H3.