Forwarding is a common technique in dealing with data hazard in pipeline design. Pls draw 5-stage pipeline diagram (you need draw three rows, each row is with 5 blocks respectively with names IF, ID, EXE, MEM, WB) with forwarding lines properly depicted so that the following sequence of 3 instructions can be run in totally 7 cycles (no idling): add $S2, $S1, $S0 sub $S7, $S2, $S5 add $S6, $S3, $S2