Simple List of Combinations From Single Row Table

Note: Novice User, using Excel 2013.

I want to create a non-repeating list of possible combinations/permutations from a single column table.

I want to make a simple table called "letters". The number of items will vary. I'm using alphabet characters in the example but imagine these could be easily apples, oranges, salad, drink....and so on.

In a separate tab I want to generate a list of non-repeating combinations, order does not matter, and I want to run this list in varying string length (1x, 2x, 3x, 4x, ...) until final result with all items combined. Sample output I imagine would be:

A

B

C

D

AB

AC

AD

BC

BD

CD

ABC

ABD

BCD

CDA

ABCD

If possible from formatting perspective, I would like to display the combinations separated by "+" character.

Any help would be appreciated.