// Two lines fly cooperatively from // the left and start collapsing and // disappearing into the right Paper 75 Pen 0 Repeat a 0 90 { Paper 75 Pen (a*(a+200)/320) Line a (100-a/5) (2*a) a Line (((60-a)/3)+a+a/5) (100-a/5) (2*a-(60-a)/3+a/10) a }