The rules that use the category "<n-pl>" are:

<np-gapsout_null-gapsin_null-wh>

<discourse_det-wh-pl> <n-pl>

<np-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy-pl>

<discourse_det-not_wh_or_gq_or_dummy-pl> <n-pl>

<n-proper_name-unit> <poss> <n-pl>

<np-not_mod-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy>

<discourse_det-not_wh_or_gq_or_dummy-pl> <n-pl>

<np-gapsout_null-gapsin_null-not_wh_or_dummy-pl>

<discourse_det-not_wh_or_dummy-pl> <n-pl>

<np-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy>

<discourse_det-not_wh_or_gq_or_dummy-pl> <n-pl>

<np-gapsout_null-gapsin_null-wh-pl>

<discourse_det-wh-pl> <n-pl>

<np-gapsout_null-gapsin_null-not_wh_or_dummy>

<discourse_det-not_wh_or_dummy-pl> <n-pl>