One specification.
Many readers.

// the same steps, as text
subsequence(1, "Read vocabulary") {
    simple(1.1, "The system reads the file
        with the words of the vocabulary");
    while(1.2, "For every line of the file...") {
        simple(1.2.1, "... splits the line at the
            word boundaries");
        simple(1.2.2, "... appends all words to
            the vocabulary");
    }
}