Polya.mws Monosubstituted alkanes, C[n]*H[2*n+1]*X General alkyls Definition Empirical study Drawing Exhaustive enumeration Alkyls according to their height Grammar Generating all structures Generating functions Table of the number of alkyls according to size and height Disubstituted alkanes, C[n]*H[2*n]*X*Y Trisubstituted alkanes, C[n]*H[2*n-1]*X*Y*Z Trisubstituted alkanes, C[n]*H[2*n-1]*X[2]*Y Conclusion: multiply substituted alkyls