| 0-5 | 6 | 7 | 8-31 | 32| Description |
|-----|---|---|-------|---|------------------------------------|
-| PO | 0 | x | xxxx | 0 | EXT200-232 or `RESERVED2` (56-bit) |
+| PO | 0 | x | xxxx | 0 | EXT200-231 or `RESERVED2` (56-bit) |
| PO | 0 | 0 | !zero | 1 | SVP64Single:EXT232-263, or `RESERVED3` |
| PO | 0 | 0 | 0000 | 1 | Scalar EXT232-263 |
| PO | 0 | 1 | nnnn | 1 | SVP64:EXT232-263 |
of this is that the Prefix Encoding is, like the 8086 REP instruction,
an independent 32-bit Defined Word.*
+Ecoding spaces and their potential are illustrated:
+
+| Encoding | Available bits | Scalar | Vectoriseable | SVP64Single |
+|----------|----------------|--------|---------------|--------------|
+|EXT000-063| 32 | yes | yes |yes |
+|EXT100-163| 64 | yes | no |no |
+|EXT200-231| 56 | N/A |not applicable |not applicable|
+|EXT232-263| 32 | yes | yes |yes |
+|EXT300-363| 32 | yes | no |no |
+
+Prefixed-Prefixed (96-bit) instructions are prohibited. EXT200-231 presently
+remains unallocated (RESERVED) and therefore its potential is not yet defined
+(Not Applicable). Additional Sandbox Opcodes are defined as EXT254 and EXT322,
+alongside EXT022.
+
# Remapped Encoding (`RM[0:23]`)
In the SVP64 Vector Prefix spaces, the 24 bits 8-31 are termed `RM`. Bits 32-37 are