Four Number Game by pooq

for i=1to 30input""a,b,c,d
do?a,b,c,d
if!a+d goto 2
t=abs(a-b)
b=abs(b-c)
c=abs(c-d)
d=abs(d-a)
a=t
loop
2?next

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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