E.coli is used in an experiment to determine the order of genes. A cross was made between Hfr H of genotype Lac+, proC+, gal+, and an F- strain negative for all these genes. After about 2 hours, the mixture was diluted and plated out on a medium containing galactose as the sole carbon source and got the pattern: Gal+ - 100%, Lac+ 30%, proC+ - 45%. Determine the order of the genes.