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

<vp-system_utterance-fin-not_mod-gapsout_null-gapsin_null-unit>

<aux-vform_fin-vform_subcat_base> <vp-system_utterance-base-not_mod-gapsout_null-gapsin_null-unit>

<vp-system_utterance-base-gapsout_null-gapsin_null-unit>

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

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

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