Don't read this or you will be exposed to answers.
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Spoilers follow below.
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um sandmark.umz
um codex.umz codex.dump
p(\b.bb)(\v.vv)06FHPVboundvarHRAk
p
dd bs=4096 skip 20 iflag=skip_bytes if=codex.dump of=umix.umz
um umix.umz