The rules that use the category "<number>" are:

<distance>

<digit-not_zero> <number>

<digit-not_zero> hundred <number>

<number>

<number> <decimal>

<up_to_four_digits>

<up_to_two_digits> <number>

<air_formation_specifier>

<number> <distance_unit-sing> <air_formation_attribute-noun>

<air_speed_number>

<digit-not_zero> hundred <number>