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B031: Routine at B031
Used by the routines at A44B and AFE8.
B031 AND A
B032 JP P,$B040
B035 NEG
B037 RRCA
B038 RRCA
B039 RRCA
B03A RRCA
B03B AND %00001111 Keep only bits 0-3.
B03D NEG
B03F RET Return.
B040 RRCA
B041 RRCA
B042 RRCA
B043 RRCA
B044 AND %00001111 Keep only bits 0-3.
B046 RET Return.
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