I do not understand why the first line and second line, the PC value increase from 0000 to 0008 while the second line the value increase from 0008 to 0010, since they are all LD order. Please explain clearly, thank you.

Example Assembly Language Program LD LD MOV LD PO,R4 P1, R1 R1, R2 P2,R3 R4,R1, R4 R1,R2, R1 R3,R1,R5 0000: 0600ff04 0000003c 0008: 0600ff01 00000040 0010: 05010002 0014: 0600ff03 00000044 001c: 00040104 0020: 00010201 0024: 01030105 0028: 0802ff00 0000001c 0030: 0704ff00 00000048 0038: 09000000 003C: 00000000 0040: 00000001 0044: 0000000a 0048: 00000000 L: ADD ADD SUB BNZ ST HLT R4,P PO: .WORD 0 P1: P2: .WOR P: . WORD 1 D A WORD