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Multiselect attribute layered navigation behavior

Multiselect attribute layered navigation behavior

I have the following scenario.


There is a multiselect attribute named "a" with options "a1", "a2", "a3" etc


Also there are two products:

product "pr1" which is connected with attribute "a" and uses options "a1", "a2" and

product "pr2" which uses only option "a1".


Currently, when "a1" option is selected in layered navigation, results will contain both products "pr1"and "pr2".


I would like to ask if it is possible to return only products which fullfil the exact selected option.


In the specific scenario, if "a1" option is selected, results ll contain only product "pr2".


Edit: magento version

If if is not possible, does anyone know if there is any extension with this ability?