Routines
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6681: Handle state wrap-around moving left
Used by the routine at 6652.
6681 LD HL,$6080
6684 LD A,(HL)
6685 CP $00
6687 JR Z,$6691
6689 LD A,$0C
668B LD ($6081),A
668E DEC (HL)
668F JR $6691
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