Task: Sentence Ordering
Input (English): Steps: (1) Put the aluminum can into a recycle bin (2) The cans are transported to a facility (3) The cans are shredded by a machine (4) The cans are heated to 1400 degrees to melt them (5) The molds are flattened and rolled into sheets to reuse.  
Where does the following step fit into the given list of steps: The molten metal is poured into molds 
Output (English):  After step 4.