You have been asked to examine organic material taken from a meteorite thought to be ...

You have been asked to examine organic material taken from a meteorite thought to be extraterrestrial bacteria.  The nuclei acids that you examine have a nitrogenous base composition different from that of all known earth-based forms.  Specifically, RNA consisted of four different bases called W, X, Y and Z.  The DNA contained one additional base called Q.  The proteins found however, were found to contain the same 20 amino acids that make up terrestrial proteins.  You would like to decipher the genetic code of this creature and decide to emulate the Nobel Prize-winning approach of Khorana, Nirenberg and Ochoa by synthesizing polynucleotides and determining the structure of translation products made from these sequences.  You obtain the following data.

5’ XYXYXYXYXYXY 3’ etc…  (Pro-leu) n
5’ XXYXXYXXYXXY 3’ etc…  (Pro) n, (Ala) n, and (Thr) n
5’ XXXYXXXYXXXY 3’ etc…  (Trp-Thr-Pro-Ala)n

If the genetic code of this organism is a commaless triplet code, what are the codons for proline, leucine, threonine, alanine and tryptophan?