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  Title:    Y log(sub2)(X)
 
  Syntax:   FYL2X
 
  See also: FYL2XP1, F2XM1
 
  Description:
 
     Calculates Z = Y log(sub2)(X) where X is taken from ST and Y from
     ST(1). The stack is popped and the result, Z, replaces Y in ST. X
     must be in the range 0 < X < infinity and Y in the range
     minus infinity < Y < infinity.
                                    -♦-