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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
table='fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF'
tr={}
for i in range(58):
tr[table[i]]=i
s=[11,10,3,8,4,6]
xor=177451812
add=8728348608
def dec(x) -> int:
r=0
for i in range(6):
r+=tr[x[s[i]]]*58**i
return (r-add)^xor
def enc(x) -> str:
x=(x^xor)+add
r=list('BV1 4 1 7 ')
for i in range(6):
r[s[i]]=table[x//58**i%58]
return ''.join(r)
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