In SPSS unless you have the SPSS Exact Test Module, you can only perform a Fisher's exact test on a 2x2 table, and these results are presented by default.
http://www.ats.ucla.edu/stat/spss/whatstat/whatstat.htm
Performing a 2x2 Chi-Square analysis when expected frequencies are less than 5.
http://www.youtube.com/watch?v=LynasIsG0xI
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