message: Clarify: width is 'number of columns'
diff: @@ -144,8 +144,9 @@ these components -- as the seed for this randomness.
  ### Representing the combined fixed table
  The fixed table can be constructed at constraint system generation time, by
  -extending all of the constituent tables to the same width, generating the
  -appropriate table IDs array, and concatenating all of the tables. Concretely:
  +extending all of the constituent tables to the same width (i.e. number of
  +columns), generating the appropriate table IDs array, and concatenating all of
  +the tables. Concretely:
  Let `t[id][row][col]` be the `col`th element of the `row`th entry in the `id`th
  fixed table.
  