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463 B

#!/usr/bin/env python
import os, sys
import zbase32
def main():
if len(sys.argv) > 1:
l = int(sys.argv[1])
else:
l = 64
bl = (l + 7) / 8
s = zbase32.b2a_l(os.urandom(bl), l)
# insert some hyphens for easier memorization
chs = 3 + (len(s)%8==0)
i = chs
while i < len(s)-1:
s = s[:i] + "-" + s[i:]
i += 1
chs = 7-chs
i += chs
print s
if __name__ == '__main__':
main()