Quick exercise fixes
An incorrect type was provided in the solution to exercise 4.1. \mathbb{B} \mapsto \mathbb{\naturals}.
Some excess terms were found in the regex for L <= 42.
Edited by Sankalp Gambhir
An incorrect type was provided in the solution to exercise 4.1. \mathbb{B} \mapsto \mathbb{\naturals}.
Some excess terms were found in the regex for L <= 42.