/usr/share/doc/libboost1.74-doc/examples/libs/spirit/example/lex/example3.input

/* the following are couplets */
(1) (1 2) (1 2 3) ...
((1)) ((1 2)(3 4)) (((1) (2 3) (1 2 (3) 4))) ...
(((1))) ...

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