Let α, β, p and q be given.
Assume Ha Hb.
rewrite the current goal using
SNoLev_PSNo α Ha p (from left to right).
rewrite the current goal using
SNoLev_PSNo β Hb q (from left to right).
An exact proof term for the current goal is Ha.
An exact proof term for the current goal is H1.
An exact proof term for the current goal is Hb.
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