A whole-tone chord can be constructed from a collection of scale steps. For example, steps 1-2-3-4 will produce an dominant ninth chord. Steps 1-2-4-5 will produce an altered dominant seventh. The number of possible patterns is limited if one eliminates all duplications produced by transposition. A little experimentation with this method will show that all chords produced by the step method are subsets of the chords in Example 6.