xnor by tails

f=$(if $(word 2,$1),$(call f,$(subst ($2  $2),1,$(subst ($2  $3),0,$1)),$3,$2),$1)
1=$(STDIN:xnor=)
2=0
3=1
$(info $f)

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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