1 # Leading comment line spaces are 2 # neither content nor indentation. 3 4Not indented: 5 By one space: | 6 By four 7 spaces 8 Flow style: [ # Leading spaces 9 By two, # in flow style 10 Also by two, # are neither 11# Tabs are not allowed: 12# Still by two # content nor 13 Still by two # content nor 14 ] # indentation. 15