Errata for "How to solve problems using Scheme"

• Section 8.4 on p. 26: There are several errors in the writeout-99 example:
  • There is a missing closing parenthesis for the teen-text and tens-text definitions.
  • The variable in the unit-word procedure should be unit-text (instead of units-text).
  • The variable in the teen-word procedure should be teen-text (instead of teens-text).