. (bad) .

copyright (Lower) . (c) .

copyright (Upper) . (C) .

copyright . (c) (C) .

reserved . (r) (R) .

trademark . (tm) (TM) .

paragraph . (p) (P) .

plus-minus . +-5 .

ellipsis . test.. test... test..... test?..... test!.... .

dupes . !!!!!! ???? ,, .

dupes-ellipsis . !... ?... ,... !!!!!!.... ????.... ,,... .

dashes . ---markdownit --- super---

markdownit---awesome

abc ----

--markdownit -- super--

markdownit--awesome .

regression tests for #624 . 1---2---3

1--2--3

1 -- -- 3 .