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 (Move Characters)

 Given two character strings in  SOURCE(*) and TARGET(*), move  "LENGTH"
 characters.  If LENGTH is  less than 1, no  characters are moved.   The
 move is effected by copying characters  from left to right from  SOURCE
 into TARGET.  In the event of  overlapping SOURCE and TARGET, this  can
 cause a fill operation.   Note that this is  different than FORTRAN  77
 CHARACTER assignment, which expressly prohibits overlap.