define(f,``ifelse(eval(\1$1\3),1,\1$1\3)'')patsubst(include(../fd/0),\(.+\)\?\(.+\)\?\(.+\),f(+\2+)f(+\2-)f(-\2+)f(-\2-))
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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