Question 954692
What does the combo consist of? 1 type of meat, 1 type of bread.
Or can I use anything?
Example: Can I make a turkey and ham with one slice of wheat and one slice of white. 

Please repost with more info. 
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If it's only 1 type of meat and 1 type of bread then,
{{{N=3*2=6}}}
T-turkey
H-ham
B-beef
W-white
E-wheat
The six combos would then be TW, TE, HW, HE, BW, BE.