Assigning {1,3,4} to the "C" bin and {2,4} to the "R" bin corresponds to choosing a permutation of these letters that represents the string CRCCR.  Here it is understood that {1,3,4}{\displaystyle \{1,3,4\}} ={\displaystyle =} {4,3,1}{\displaystyle \{4,3,1\}}  ={\displaystyle =} {3,4,1}….{\displaystyle \{3,4,1\}\ldots \,.}  The integers 1-5 are the distinguishable objects, while the three "C"s are identical, as are the two "R"s.
Own work
Guy vandegrift