> The following rules define
> [list items](https://spec.commonmark.org/0.30/#list-items):
>
>  1. Basic case. If a sequence of lines Ls constitute a sequence of
>     blocks Bs starting with a character other than a space or tab,
>     and M is a list marker of width W followed by 1 ≤ N ≤ 4 spaces of
>     indentation, then the result of prepending M and the following
>     spaces to the first line of Ls*, and indenting subsequent lines
>     of Ls by W + N spaces, is a list item with Bs as its contents.
>     The type of the list item (bullet or ordered) is determined by
>     the type of its list marker. If the list item is ordered, then it
>     is also assigned a start number, based on the ordered list marker.
>
>     Exceptions:
>      1. When the first list item in a list interrupts a paragraph—
>         that is, when it starts on a line that would otherwise count
>         as paragraph continuation text—then (a) *the lines Ls must
>         not begin with a blank line*, and (b) if the list item is
>         ordered, the start number must be 1.