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Pragmatic Guide to Sass by Michael Lintorn Catlin, Hampton Catlin

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join($list1, $list2, $separator = "auto")

Joins together two lists into a new list.

Unless the ‘$separator‘ argument is passed, if one list is comma-separated and one is space-separated, the first parameter’s separator is used for the resulting list. If the lists have only one item each, spaces are used for the resulting list.

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