6-"Object" Bi-Directional Non-Redundancy Diagram:

This problem is related to finding the minimum
number of 12EDO 6-interval-class interval strings
which will be stylistically neutral in the sense that
all 6 intervals will appear at both the beginning and
the ending of at least one interval string, and also
that all 30 possible successive pairs of succeeding
intervals will also be sounded overall.

Here is the ordering in discrete groups of 6:

1. 123456

2. 246135

3. 362514

I was going to post a continuous ordering,
but I saw that one successive interval pair
was repeated, so this solution isn't valid
as a continuous string of objects/intervals.

The discrete orderings are meant to be
played/sounded forward and then backwards.

Bill.Flavell at GMail.com