Regular Expressions I

Let R be the language described by the following regular expression:

(a|b)*(c|d)e?f+

How many of the following strings are NOT members of R?

abc, aabbd, df, abbcdf, abdef, bbacf, 
abbbbbbdef, aabbcef, abbceef, abababcf, 
abcdf, f, ef, def, be, abe, acef
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