Asyoureadthroughthisbook,wewillintroduceseveralabstractideasinasconcreteawayaspossible.Asyoubecomefamiliarandcomfortablewiththeseideas,youwillbegintothinkoftheabstractionsasactualconcreteobjects.Havingalreadygonethroughthisprocessourselves,we'vechosentocallcomputerscienceªthe