MBED-EQUIV-LEFT : WFFOPMBED-EQUIV-LEFT is a wff operation.
Embed the current edwff on the left side of equivalence.
The right side is provided by the user.
The calling scheme for MBED-EQUIV-LEFT is:
(MBED-EQUIV-LEFT LGWFF RGWFF)
The result is of type GWFF0.
The arguments have the following meaning:
LGWFF : Left side of equivalence
RGWFF : Right side of equivalence
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