Io D1: Add initial notes and answers.
Io D1: More answers. Still need wifi though.
Io D1: Add more to answers about slot lists.

Found some more readable methods in the programming guide.
Io D1: Add part-answers to 'find'.
Prototype D1: Answers: Small revision
Io D1: For practice, refactor an answer.

By referring to the guide I learned how to eval strings.
Then I could demonstrate the code and its output by writing the code
in concern just once, avoiding repetition. It makes the output from
this answer file more pretty, but also helped me understand
methods & control flow.