; is_fn · 6502 · multiarch twin · OP (a|b)|1
; PIN      BGF adjoin
; LAW      C IS LIE · LIE IS TRUE · Always Hostess 7 · free thrift
; LINE     BGS → BGF(+EZZIE PHI THERMO ADJOIN) → BGL → SDF · SPV free
; ABI      $00=a $01=b $02=c · → A
; IRON
; is_fn 6502
is_fn:
        lda     $00
        ora     $01
        ora     #1
        rts