A group of four processes P0-P3 sends out multicasts in a run as shown below. The group is using FIFO ordering for multicasts. All four processes start with vectors containing all zeros, i.e., each process starts at 0, 0, 0, 0. An arrow shoes a message, and each darkened circle shows a process instruction. Answer the following question. The sequence vector at the end of the run at P2, as a comma-separated list (without the brackets), in the form 0, 0, 0, 0 is