*** EXAM: Flip Flops using NOR gates

Please help me with

  1. Design S-R latch with NOR gate
  2. Design S-R flip flop with NOR gate
  3. Design J-K flip flop with NOR gate
  4. Design D flip flop with NOR gate
  5. Design T flip flop with NOR gate
  6. Design a half subtractor. Design a full subtractor using two half subtractors.

***Must show truth table for each of these circuit.