特技关卡 12-1
a = yes
if not a
turn left
step 10
特技关卡 12-2
for b in bananas
if b.green()
goat.goto b
else if not b.rotten()
goto b
特技关卡 12-3
for b in bananas
if not b.green()
goto b
特技关卡 12-4
for b in bananas
if not b.green()
turtle.goto b
特技关卡 12-5
for b in bananas
if not (b.green() or b.rotten())
goto b
特技关卡 12-6
x = 6
7.times ->
b = bananas[ x-- ]
if not b.green() and not b.rotten()
goto b