45x31:Bn1f1fBnBc2zk1i1bBcBdBg0dBc0b1zzb1d1za1dBw3c1v0n1i1n1k1a2uBa2o0nBa0n1i1n1gBnBi0d1aBq2aBd1hBm0k1m0e0o1e1o1l1b1hBa1hBbBi1nBdBcB
45x31:Bn1f1fBnBc2zk1i1bBcBdBg0dBc0b1zzb1d1za1dBw3c1v0n1i1n1k1a2uBa2o0nBa0n1i1n1gBnBi0d1aBq2aBd1hBm0k1m0e0o1e1o1l1b1hBa1hBbBi1nBdBcB
Pretty difficult, but reasonable
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