Unique Combinations/Permutations Of Words

I have a list for example:

apple
pear
grape
orange

i'm after some code that will create every possible combination of the list.

The examples i've found in the archives give all possible combinations of the same list in a different order

e.g apple, pear, orange, grape.......apple, orange, pear, grape.........apple, grape, orange, pear etc etc etc... THIS IS NOT WHAT I'M AFTER.

i'm after every possible combination starting right at the beginning with single words

e.g

apple
apple, pear
apple, pear, orange
apple, pear, orange, grape
pear, orange,
pear, orange, grape
orange,
orange, apple

etc etc you get the idea..... but i do not want repititions like

apple, pear.........pear, apple.
apple, orange, pear ...........pear, orange, apple.