Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

[Q]: Potential energy is divided into ____ different types of energy.
[A]: three


[Q]: Stereo cameras track the fly's movement in ____ dimensions.
[A]: three


[Q]: Postal codes are ____ characters long and are a mixture of three letters and three numbers.
[A]:
six