Lets say you change oil & filter at proper intervals do an additional oil change in between, and skip the filter. (mechanics.stackexchange.com)
To control or eradicate fleas, you must apply the flea treatment correctly and at proper intervals. (broadwayanimalhospital.com)
We know without a doubt that the recipe for a good night's sleep is an age - appropriate daytime schedule with good naps and proper intervals of wakefulness. (weebeedreaming.com)