6EVAMGQ66R6WRLUOXNXQ4LIL52HHAIA46ZPJGZUO533D4CGPHPDAC
7GQ5TOWHFPXHGR7RFYWHWWMO32MDSVVK7WRLWDEROVTKCQRHRMTAC
FKENDSMEJXEZPAT6K5TYJC2KZBVYKMXA7LN7ZVPZMYIBODWIB64AC
if c then
while c do
unwind_steps(c.prev, out)
c = c.prev