theorem Th16: :: FSCIRC_2:16

for x, y, c being set st x <> [<*y,c*>,and2] & y <> [<*x,c*>,and2a] & c <> [<*x,y*>,and2a] & c <> [<*x,y*>,'xor'] holds
InputVertices (BitSubtracterWithBorrowStr (x,y,c)) = {x,y,c}