Aldol, Cannizzaro, or neither?

You will finish a program that predicts what happens to an aldehyde in dilute and in concentrated sodium hydroxide. It also counts the products of a crossed aldol reaction.

The idea. A compound with an alpha hydrogen does the aldol reaction in dilute base. An aldehyde with no alpha hydrogen does the Cannizzaro reaction in concentrated base. A ketone with no alpha hydrogen does neither.

Your tasks.

1. Complete reaction(alpha_h, is_aldehyde) so that it returns "aldol" when there is an alpha hydrogen, "cannizzaro" for an aldehyde with none, and "none" otherwise.
2. Complete crossed_products(a, b) so that it returns the number of aldol products of two compounds, where each argument is True when the compound has an alpha hydrogen.