NAND only SR-JK-D-T flip flop.
Switch 1 (S1) : {D, T} control, {S, J} control for SR and JK.
Switch 2 (S2) : 0 -> {SR, D}, 1 -> {JK,T}.
Switch 3 (S3) : 0 -> {SR, JK}, 1 -> {D, T}.
Switch 4 (S4) : {R, K} control for SR and JK.
To get desired flip flops :
S2 S3 => Flip-flop
0 0 SR
0 1 D
1 0 JK
1 1 T
Have a nice day! ✌
