I'm trying to work out if this is a thinko on my part or a typo on your part: First you write: > a system that lets you look up the value for a given key and

I'm trying to work out if this is a thinko on my part or a typo on your part: First you write: > a system that lets you look up the value for a given key and then later on you write: > if they think the problem of looking up a key by value has been solved before Did you mean to say "looking up a value by key" or am I misunderstanding it? (Given that no one else has commented on it makes me question my question but I'm trying to get over my concern of being wrong on the internet and asking to be sure. :) )