The rules that use the category "<basic_nl_command-command-gapsout_null-gapsin_null>" are:
<basic_nl_command-command-gapsout_null-gapsin_null>
<basic_nl_command-command-gapsout_null-gapsin_null> <sequence_adv_nl_command>
<basic_nl_command-command-gapsout_null-gapsin_null> and <nl_command-command>