Filter by attributes

Hello.
Does anyone know how to implement the product filter at frontend?
Filtration by attributes, I suppose, would be just great!
Thank you in advance!
That function is there just called "product groups" set it and assign products to see filter at front end
Sorry I am new to Litecart. Where can I find "product group". I cannot see it in the admin panel.
I'm interested in the answer, too.
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