1> Str = "abcd". "abcd" 2> L = test:length(Str). 4 3> Descriptor = {L, list_to_atom(Str)}. {4,abcd} 4> L. 4 5> b(). Descriptor = {4,abcd} L = 4 Str = "abcd" ok 6> f(L). ok 7> b(). Descriptor = {4,abcd} Str = "abcd" ok 8> {L, _} = Descriptor. {4,abcd} 9> L. 4 10> 2#101. 5 11> 1.85e+3. 1850