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List

length(@list) Returns the number of elements in a value list.
extract(@list, @position) Returns the value at a specified position in a list.
A list is comma-separated or space-separated.
@l1: 1px, 2px, 3px, 4px;
@l2: apple coconut pear melon;
.a:after{
   content: length(@l1) extract(@l2,3);
}

.a:after {
  content: 4 pear;
}