Create table from combinations in excel

Question

I'm looking for a way to combine these values into different columns in Excel: I have this table of users (in this example we only have 3 users, but could be up to 5 users):

users
angel
luis
kevin

What I need to do, is combine those names into 3 different columns (of course using an Excel formula or script), and at the end look like this:

projects	oncall	operations
angel	kevin	luis
angel	luis	kevin
luis	angel	kevin
luis	kevin	angel
kevin	luis	angel
kevin	angel	luis
angel	kevin	luis
angel	luis	kevin
luis	angel	kevin
luis	kevin	angel
kevin	luis	angel
kevin	angel	luis
etc..	etc..	etc..

So, you can see that the users repeat the same amount of time in each column, example: look at the name "kevin", it appears 4 times in the column "operations", as well as luis and angel, the combination is really accurate.

The "projects" column must always repeat the same user 2 times, the "oncall" column must never repeat the user 2 times, and the operations column doesn't really matter, Here is another example, in this case with 4 users:

users
kath
mary
yen
isa

projects	oncall	operations
kath	mary	yen & isa
kath	isa	mary & yen
mary	kath	yen & isa
mary	yen	kath & isa
yen	mary	kath & isa
yen	isa	kath & mary
isa	kath	mary & yen
isa	yen	kath & mary
kath	mary	yen & isa
kath	isa	mary & yen
mary	kath	yen & isa
mary	yen	kath & isa
yen	mary	kath & isa
yen	isa	kath & mary
isa	kath	mary & yen
isa	yen	kath & mary

There can only be 1 user assigned to projects and to oncall, operations can have more than 1 user. Hope I made myself clear, any help is highly appreciated!