underscore Inline test model #1, asterisk Inline test model #1, one two Inline test model #1, three four Inline test model #1, a Inline test model #1, b Inline test model #1

strong Inline test model #1 and em Inline test model #1 and strong Inline test model #1 and em Inline test model #1

line Inline test model #1
line Inline test model #1
line Inline test model #1

an empty emphasis {} {{}} is not an emphasis

mixed double and Inline test model #1 single asterisk Inline test model #1 spans Inline test model #1