## Syntax: Marks are greedy and must be "glued" with contents

b i u `m` r
bo it un `mo` ra
bold ital undr `mono` raw
bo ld it al un dr `mo no` r aw
bo * ld it / al un _ dr `mo ` no` r " aw
bo **ld it //al un __dr `mo ``no` r ""aw
bo ** ld it // al un __ dr `mo `` no` r "" aw
**bold** //ital// __undr__ ```mono``` ""raw""
*bold* /ital/ _undr_ ``mono`` "raw"

## Syntax: Repetition is greedy

* / _ ``` "
** // __ ```` ""
*** /// ___ ````` """
**** //// ____ `````` """"
***** ///// _____ ``````` """""
****** ////// ______ ```````` """"""

## Invalid: No contents

**** //// ____ ```` """"
** ** // // __ __ `` `` "" ""

## Invalid: Contents not "glued" with marks

** bold** // ital// __ undr__ `` mono`` "" raw""
**bold ** //ital // __undr __ ``mono `` ""raw ""
** bold ** // ital // __ undr __ `` mono `` "" raw ""