In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Armaments manufacturers use lithium to produce tritium in _ ways.
[A]: two


[Q]: Most cats have only four to _ toes per paw, depending on whether it is the front or back paw.
[A]: five


[Q]: Hybrid systems are dynamical systems with _ levels of description.
[A]:
two