A computer readable storage medium tangibly embodying machine-readable digital data arranged to facilitate expedited searching. The data includes a plurality of words residing in a table having rows and columns, each word residing in a different row and each letter of the word occupying a different column in that row. Each continuous run of same letters in a column forms an interval. The words are positioned relative to each other to maximize lengths of the intervals, and/or optimize efficiency of compression of the columns by run length encoding.