The rules that use the vocabulary item "nine" are:

<nlb-careful>

<abort_verb> nine line brief

<digit-9>

nine

<hour>

nine

oh nine

zero nine

one nine

<nlb-nlb2>

<abort_verb> nine line brief

<nlb-nlb6>

<abort_verb> nine line brief

<controller_flight_advisory>

send nine line brief

ship nine line brief

stand by for nine line

stand by for nine line brief

stand by nine line

stand by nine line brief

stand by to copy nine line

stand by to copy nine line brief

transmit nine line brief

<nlb-not_command_or_system_utterance_or_user_response>

<abort_verb> nine line brief

<digit-not_zero>

nine

<nlb-nlb3>

<abort_verb> nine line brief

<nlb-nlb7>

<abort_verb> nine line brief

<digit-pl>

nine

<scale_number-gapsout_null-gapsin_null>

nine hundred

nine hundred fifty

nine thousand

nine thousand five hundred

nine hundred thousand

nine hundred fifty thousand

<air_call_sign_designator>

dash nine

<digit_not_one>

nine

<nlb-nlb4>

<abort_verb> nine line brief

<nlb-nlb8>

<abort_verb> nine line brief

<digit>

nine

<digit-not_zero-pl>

nine

<nlb-nlb1>

<abort_verb> nine line brief

<nlb-nlb5>

<abort_verb> nine line brief

<nlb-nlb9>

<abort_verb> nine line brief