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print "---------- while"
i=0
while i<0
print i
i=i+1
end
i=0
while i<10
print i
i=i+1
end
print "---------- dowhile"
i=0
dowhile i<0
print i
i=i+1
end
i=0
dowhile i<10
print i
i=i+1
end
print "---------- for"
for a: ['a','b','c']
print a
end
for i,a: ['a','b','c']
print i
print a
end