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Apply add_nat_SR with u12, u4, λ x0 x1 . x1 = u17 leaving 2 subgoals.
The subproof is completed by applying nat_4.
Apply add_nat_SR with u12, u3, λ x0 x1 . ordsucc x1 = u17 leaving 2 subgoals.
The subproof is completed by applying nat_3.
Apply add_nat_SR with u12, u2, λ x0 x1 . ordsucc (ordsucc x1) = u17 leaving 2 subgoals.
The subproof is completed by applying nat_2.
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