A mixture contains these parts: Sand, Sawdust, Iron pieces, Salt, and Glass marbles. Below are six steps in a process that can separate all the parts of this mixture. Put the steps in the correct order. Write '1' in front of the first step, '2' in front of the second step, and so forth. Also, write the part that will be separated as a result of each step. A few of the steps can happen at different times.