NFA to DFA

[boaz@usa.pipeline.com(Boaz Chow)]

do you know how to implement SET adt and the operations in Ada? 
 
I have this project that requires me to check if a pattern is in a given
string by converting NFA to DFA. 
 
for example : 
 
abcd is in the string difjdabcddkjf 
 
I have done this with a short cut (i.e. I've done this without using SET) 
 
but that's only the first part.  the second part requires me to write a
program that generates another program (a source code) that implement the
operation for transfering a NFA to a DFA.  This I need SET!  ADA does not
have SET!!! 
 
I have tried to use an array to implement set but that gives me a big
problem. 
 
any idea on what the best way to implement SET? 
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