Brain Teaser: The Answer

The secret is what you see on each line and what you see becomes the next line. The answer as below:

Line 1 is "Two ones" (2 1)

Line 2 then becomes "One two, and one one" (1 2 1 1)

Line 3 therefore is "One one, one two and two ones" (1 1 1 2 2 1)

Line 4 is "Three ones, two twos and one one" (3 1 2 2 1 1)

Line 5 is "One three, one one, two twos and two ones" (1 3 1 1 2 2 1 1)