Jake expands on Jean-Paul Sartre's famous existentialist line " existence precedes essence ", saying " existence not only precedes essence : in the case of human beings it rather defies essence . " The Doctor tells Jake, " Choosing is existence : to the extent that you don't choose, you don't exist . " To cope with inability to make decisions, the Doctor prescribes three therapies : the arbitrary principles of Sinistrality ( " If the alternatives are side by side, choose the one on the left " ), Antecedence ( " if they're consecutive in time, choose the earlier " ) and Alphabetic Priority ( " choose the alternative whose name begins with the earlier letter of the alphabet " ).
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