Recombination frequency

In rabbits, chocolate-colored fur (w +) is dominant to white fur, straight fur (c +) is dominant to curly fur (c), and long ear (s +) is dominant to short ear (s). The cross of a trihybrid rabbit with straight, chocolate-colored fur and long ears to a rabbit that has white, curly fur and short ears produces the results in the table.
Phenotype   Number
White, short, straight   13
Chocolate, long, straight   165
Chocolate, long, curly   13
White, long, straight   82
Chocolate, short, straight   436
Chocolate, short, curly   79
White, short, curly   162
White, long, curly   450
1400


Calculate the recombination frequency between c and w pair of genes.