are extended to either scalar or vector and to select CR Fields 0..127
as specified in SVP64 [[sv/svp64/appendix]]
-When considering an "array" of branches, there are two useful modes:
+When considering an "array" of branches, there are four useful modes:
+AND, OR, NAND and NOR of all Conditions, which typically have names
+ALL, ANY/SOME, ??? and NONE. NAND and NOR may be synthesised by
+inverting `BO[2]` which just leaves two modes:
* Branch takes place on the first CR test to succeed
(a Great Big OR of all condition tests)