ENG : the cat should go forward and back on the scene forever. Instead it remains on the left. How do we fix the program? two constrains: 1) you can't use the block [if on edge, bounce] 2) the cat has to start at x= -250 ITA : il gatto dovrebbe andare continuamente avanti e indietro sulla scena. Invece rimane bloccato sulla sinistra. Come risolvere il problema two constrains: 1) you can't use the block [if on edge, bounce] 2) the cat has to start at x= -250