We will consider a structure for a collection of chords that will provide a tool for writing abstract music as patterns of notes with few tonal features.
Start with two notes: Say DF, so use the first structure to find the third note, namely C. Now choose a note not already used, for example G, so we can determine a fifth note from the chart as the third note in the chord, CGE. to continue, choose a not yet used, for example B, and the 7th note is determined to complete the chord, EBF.
The sequence is now DFCGEBF. Now use the letter A (that has not yet been used) and we look for the chord with F and A to find the next note: G.
The sequence is now DFCGEBFAG. Continuing ,we can choose the next letters when needed from the letters that are used as little as possible and then use the chord structure to determine the next note.