= No markup

asterisks: ~* "~*" '~*' (~*) (~* ~[*] ~{*} 1~*x BOM32_~* double asterisks: ~**
a~**b O(N~**2) etc. backquotes: ` `` etc. underscores: _ __ __init__
__init__() etc. vertical bars: ~| ~|| etc.