Single asterisks: *italic text*
Single underscores: *italic text*
Double asterisks: **bold text**
Double underscores: **bold text**
Combined: **bold with *nested italic***
Mixed markers: *italic with **bold** inside*
Adjacent: *first* and *second* emphasis
Intraword: un*frigging*believable and un**frigging**believable
This is \_ not emphasized \_