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

<firing_rate_command>

<change_parameter> <firing_rate_descriptor> by <firing_rate_setting>

<by_fire_phrase>

by fire

<speed_command>

<change_parameter> <speed_descriptor> by <speed>

slow down by <speed>

speed up by <speed>

<area_measure>

<general_distance> by <general_distance>