Create a Simple Combination Tool

Hi, I need a program that can generate all possible letter combinations (of a given length) from a list of letters I input. For example, let's say I input a,b,c, and set the length at 2. Here is what the program should output: aa ab ac ba bb bc ca cb cc Let's say I input the same a,b,c but set the length at 3. Here is what the program should output: aaa aab aac aba abb abc aca acb acc baa bab bac bba bbb bbc bca bcb bcc caa cab cac cba cbb cbc cca ccb ccc I'd also like to be able to add a prefix and a suffix to the output strings. I'll need to generate domain name ideas, so I'd like for example to be the final output something like [login to view URL] [login to view URL] ... and so on. The final output of the program should be a .txt file, containing each output string on a new line. As you'll see, this program needs the EXACT features of what you can find here: [login to view URL] The reason I need a separate program is because the online version freezes when I enter 6 or more characters to combine in all possible variations. I hope an offline tool won't have this problem. Let me know if you have any questions. Thanks! P.S.: I need this tool VERY URGENTLY, possibly today or tomorrow. I hope that it is manageable. I can pay somewhere between $30-100 USD.