The rules that use the category "<engagement_loc_mod-gapsout_null-gapsin_null>" are:

<unit_nom-sing>

<unit_n-sing> <engagement_loc_mod-gapsout_null-gapsin_null>

<unit_nom-not_det-sing>

<unit_n-not_det-sing> <engagement_loc_mod-gapsout_null-gapsin_null>

<unit_nom-not_det-pl>

<unit_n-not_det-pl> <engagement_loc_mod-gapsout_null-gapsin_null>

<unit_nom>

<unit_n> <engagement_loc_mod-gapsout_null-gapsin_null>

<unit_nom-pl>

<unit_n-pl> <engagement_loc_mod-gapsout_null-gapsin_null>