(shifter N
(SRWC0 N (First I (Inv) (Pass)) (second I (Inv) (Pass)))
(SRWC1 N (First I (Inv) (Pass)) (second N (Inv) (Pass)))
(SRWC2 N (First N (Inv) (Pass)) (second I (Inv) (Pass)))
(SRWC3 N (First N (Inv) (Pass)) (second N (Inv) (Pass)))
(SRWC4 N (First L (Inv) (Pass)) (second L (Inv) (Pass)))
) )
(SRWC0 I (First I (Inv) (Pass)) (second I (Inv) (Pass)))
(SRWC1 I (First I (Inv) (Pass)) (second N (Inv) (Pass)))
(SRWC2 I (First N (Inv) (Pass)) (second I (Inv) (Pass)))
(SRWC3 I (First N (Inv) (Pass)) (second N (Inv) (Pass)))