Twist, twist, twist, turn , twist, twist, twist, turn , twist, twist, twist, turn

produces:


0,1,2,3,- 1 3 , 2 3 , 5 3 , 8 3 ,- 3 8 , 5 8 , 13 8 , 21 8 ,- 8 21



To return to zero:

if the fraction is negative, then twist (+1);
if the fraction is positive, then turn (-1/x).

twist, turn , twist, twist, turn , twist, twist, twist, turn , twist, twist, twist, turn , twist, twist:
13/21, -21/13, -8/13, 5/13, -13/5, -8/5, -3/5, 2/5, -5/2, -3/2, -1/2, 1/2, -2, -1, 0