The rules that use the category "<n-not_proper_name-sing-np_type_null>" are:

<np-not_mod-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<np-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<np-gapsout_null-gapsin_null-np_type_null-not_wh-sing>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<n-not_proper_name-sing-np_type_null>

<np-gapsout_null-gapsin_null-np_type_null-not_wh_or_gq_or_dummy-sing>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<n-not_proper_name-sing-np_type_null>

<np-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy-sing>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>

<discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <discourse_det-indef-sing> <n-not_proper_name-sing-np_type_null> <conj-or> <discourse_det-indef-sing> <n-not_proper_name-np_type_null>