Filename {Nf}f_0
These layouts have a single row of Nf
fields, e.g., 5f_0 is:
XXXXX
Filename {Nf}f_{Nu}{shift}
These layouts have two rows, with Nf
total fields and Nu
fields in
the upper row. A letter shift
indicates the shift of the top row
relative to the bottom. E.g., 7f_2a is:
XX
XXXXX