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