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Need help figure out the order of GENES.

Okey here is the info

Bacterial cells of genotype pur- pro+ his+ were transduce with P1 bacteriophage grown on bacteria of genotype pur+ pro- his-. Transductants containing pur+ were selected and tested for the unselected markers pro and his. The number of pur+ colonies with each of the four genotype were as followed:

pro+ his+ 102
pro- his+ 25
pro+ his- 160
pro- his- 1

what is the gene order?

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