A shortsety is a sequence of one or more short bold
tags. The term follows the fashion of the Revised Report, where the
suffix -ety means “or empty”.
The Algol 68 modes int, real, compl,
bits and bytes can be prefixed with any number
of short tag words. The effect of each short is
to half the precision of the mode.
At some point, however, a “saturation” point is reached where the
addition of extra short has no further effect on the mode.
Where that point resides is up to the particular implementation.
For example, if the precision of int is four bytes or
32-bit, the precision of short int is 16-bit, and the
precision of short short int is 8-bit.
Simplified [RR 1.2.1.F]:
F) SHORTSETY :: short SHORTSETY ; EMPTY.