Task: Sentence Ordering
Input (English): Steps: (1) The oil is transported to stores (2) Oil is purchased by homeowners (3) Oil is placed into a stove in the house (4) The oil is lit on fire, and burns for a long time (5) The warm air off of the oil travels through the house  
Where does the following step fit into the given list of steps: Oil is gathered through mining operations 
Output (English):  Before step 1.