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

[EX Q]: Bifocal lenses have _ distinct segments with different powers.
[EX A]: two

[EX Q]: Economic equilibrium occurs where the _ lines intersect.
[EX A]: two

[EX Q]: Cleavage is perfect in _ directions forming splintery fragments.
[EX A]:
two