Combinations [String]

Finds all items in B whose first column matches A. Forms all the combinations with the resulting pairs. Combinations are made across the groups that are identified by the values in A. Items from A that do not match B are part of the combinations and form their own singleton group.

Example:

 A
----
 x
 y
 z

 B
-------
 x | x1
 x | x2
 x | x3
 y | y1
 y | y2

 C
----
 x y z
 x y1 z
 x y2 z
 x1 y z
 x1 y1 z
 x1 y2 z
 x2 y z
 x2 y1 z
 x2 y2 z

• A [STRING]: a list of strings to be searched
• B [STRING,STRING]: a list of pairs to be searched with A

• C [STRING]: All combinations across the groups identified in A using B + A values