MS98-FIRST-FRAGMENT : FLAG

MS98-FIRST-FRAGMENT is a flag or parameter.
If non-NIL, this will move a single fragment to the
beginning of the literal ordering, as follows:
T : set of support strategy, more or less. The starting
fragment will be the last non-duplicate fragment
enumerated. This will be the rightmost part of the wff
to be proven.
n : (for integer n) the starting fragment will be whichever
fragment contains LEAFn. If this leaf is part of a duplicate
fragment, or does not exist at all, then this will behave
like T.

NB: This flag overrides MS98-BASE-PRIM; the chosen fragment may
always be part of a primitve substitution.
See also MS98-FRAGMENT-ORDER.
MS98-FIRST-FRAGMENT takes values of type SYMBOL-OR-INTEGER.
It belongs to subjects MS98-1 .
Its default value is NIL
Its current value is NIL.

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