The changes to the original codes are 178301P, 178302P, 178303P, 178306P, 178307P, 178308P.<br/><br/>a. The original combinations are respectively 178301, 178302, 178303, 178306, 178307, 178308.<br/><br/>b. The original combinations are in the same order 178301, 178302, 178303, 178306, 178307, 178308.<br/><br/>Which do you prefer?<br/><br/>Which do you think you would use (as this may be different from that which you choose)?