The category "<vp-system_utterance-inf-gapsout_null-gapsin_null-system>" can be expressed as follows:
<adv> <vp-system_utterance-inf-not_mod-gapsout_null-gapsin_null-system>
<aux-vform_inf-vform_subcat_base> <vp-system_utterance-base-gapsout_null-gapsin_null-system>