Custom Rule

[slawson]

I have a dictionary file with common English words.  I want to create a rule that will take one word and combine it with every other word in the same dictionary file, then add three digits to the end.  

I know I can add the digits at the end with a hybrid attack, but I am not sure how to write the rule to combine words in the dictionary file.

I would also like to make all letters lower case even if the dictionary file has otherwise.

I am sure most of you already see what I am wanting to do, but here is an example.

My dictionary has three words:  first second third

I am trying to get the following combinations as well as brute force 3 digits at the end.

firstfirst (with 000-999 at the end)
firstsecond (with 000-999 at the end)
firstthird (with 000-999 at the end)
secondfirst (with 000-999 at the end)
secondsecond (with 000-999 at the end)
etc

Thank you in advance for any insight.