>    xorlw    value_a
>    skpnz
>    goto      it_is_a
>    xorlw    value_a^value_b
>    skpnz
>    goto      it_is_b
>    xorlw    value_b^value_c
              ^^^^^^^^^^^^^^^
should this not be value_a^value_b^value_c ??

>    skpnz
>    goto      it_is_c

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