By spacing, there are 2 groups of 10 pendants each.
All pendants (except the last one) have a subsidiary.
The numbers on the pendants range from 0 to 7 with each value present at least once, and the subsidiaries are 0 to 5 with each value present at least once. Further, the sum of each pendant and its subsidiary is 0 to 8 with each value (except 7) present at least once.
