Everyone toils away during Alice Birch's new play,Anatomy of a Suicide: The audience, which attempts to decipher three separate but interconnected storylines being depicted simultaneously; the actors, who display perfect, split-second timing as they deliver dialogue constructed with the complexity of a musical fugue; and most of all the British playwright herself, who has created this jigsaw puzzle of a theatrical event that seems less designed to convey its provocative themes than to illustrate