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preprocessing-file := [group] group := group-part group group-part group-part := [pp-tokens] new-line if-section control-line if-section := if-group [elif-groups] [else-group] endif-line if-group := # if constant-expression
new-line [group] # ifdef identifier new-line [group] # ifndef identifier new-line [group] elif-groups := elif-group elif-groups elif-group elif-group := # elif constant-expression new-line [group] else-group := # else new-line
[group] endif-group := # endif new-line control-line := # include pp-tokens new-line # define identifier replacement-list new-line # define identifier([identifier-list] ) replacement-list newline # undef identifier new-line # line pp-tokens
new-line # error [pp-tokens] new-line # pragma [pp-tokens] new-line # new-line replacement-list := [pp-tokens] pp-tokens := preprocessing-token pp-tokens preprocessing-token new-line := the new-line character
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