Task: Sentence Ordering
Input (English): Steps: (1) The butterfly starts as an egg (2) The egg hatches to form a larva, also called a caterpillar (3) The caterpillar then forms itself into a pupa, or chrysalis (4) The caterpillar in the chrysalis begins change, a process called mmetaphorphosis (5) The caterpillar completes its metamorphosis and has turned into a butterfly (6) The adult butterfly emerges out of the chrysalis and flys away!  
Where does the following step fit into the given list of steps: The carterpillar molts (loses its skin) many times as it grows 
Output (English):  After step 2.