I have an ARRAY containing some ITEMS. The amount may DIFFER.

["foo","bar","THE","brown","fox",REAL","lazy","dog"]

The only items I want from this array is "THE" and "REAL"

Basically the array always starts with two useless items, and then starts listing real items. After every
real item there is two more useless items. The thing is that I only want to collect the real items just by
doing some math, not depending on the items value.

Does someone know a nice way doing this? Or can give me a hint :)