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List

length($list) Returns the length of a list.
nth($list, $n) Returns a specific item in a list.
set-nth($list, $n, $value) Replaces the nth item in a list.
join($list1, $list2, [$separator]) Joins together two lists into one.
append($list1, $val, [$separator]) Appends a single value onto the end of a list.
zip($lists…) Combines several lists into a single multidimensional list.
index($list, $value) Returns the position of a value within a list.
list-separator(#list) Returns the separator of a list.
The separator name must be 'space', 'comma', or 'auto'.
$a: 1px solid black;
$b: 5px dotted red;

div:after{
   content: join($a,$b,comma);
}

div:after {
  content: 1px, solid, black, 5px, dotted, red;
}