Table 2.

The number of architectures described by each rearrangement class (Table 1), under three natural measures

Rearrangement class	(A) Allsolution	(B) Common solutions	(C) Majority class
Simple
New domain	4646	4483	4387
Fission	1991	1387	875
Fusion of new domains	730	586	489
Fusion of parent architectures	3734	3409	2825
Fusion of both	2266	1921	1610
Complex
Deletion	108	80	55
Insertion of new domain	27	19	13
Insertion of parent architecture	61	48	30
Other	914	690	473
Tie			895
Total	14,477	12,623	11,652

A, The number of architectures with any solution of that class. B, The number of architectures whose most common solutions, i.e. the solutions that were proposed for the largest number of new occurrences, include that class. C, The number of architectures whose most common solution(s) are of exactly that rearrangement class. In A and B, an architecture can be attributed to more than one class. In C, architectures whose most common solutions describe more than one class are labeled Tie.