The rules that use the category "<vp-base-not_mod-gapsout_null-gapsin_null-unit>" are:

<vp-base-gapsout_null-gapsin_null-unit>

<adv> <vp-base-not_mod-gapsout_null-gapsin_null-unit>

<vp-inf-not_mod-gapsout_null-gapsin_null-unit>

<aux-vform_inf-vform_subcat_base> <vp-base-not_mod-gapsout_null-gapsin_null-unit>