keyword tool that generates all possible combinations of keywords

I need a tool which does tis: I would like to have 5 textfields (A,B,C,D,E). In all of these fields I can write words - each word in a separate line - and the tool should do this: 1) create a list of all possible combination (permutation) of all words and all textfields OR 2) create a list of only the possible combinations I want - I would like to select the possible combinations with checkboxes: Example: A B C or A C B or E B A and so on - each combination should be selectable through checkboses - it should support multi-select - more than one checkbox. The result should be: written in a txt-file (each combination in a separate line) or written in a mysql-database - I would like to choose which one to use. Important: the maximum number of words I put into the 5 textfields should not be limited in any way and the tool should not be limited by RAM of the PC or by maximum memory of the webserver ([login to view URL]). It should just process all the combinations and write them into textfile or database. An axample of an online solution you can find here: [login to view URL]