What is the recombination frequency between the L/l gene and the T/t gene?

a wild-type trihybrid soybean plant is crossed to a pure-breeding soybean plant with the recessive phenotypes pale leaf l, oval seed (r), and short height (t).  The corresponding dominant wild-type alleles result in dark leaves (L), round seeds (R), and tall height (T). The results of the three-point test cross are shown in the table.

 Phenotype  Number
 Pale, round, tall  648
Pale, oval, tall 64
 Pale, round, short  10
 Pale, oval, short  102
 Dark, oval, tall  6
Dark, oval, short 618
 Dark, round, short  84
 Dark, round, tall  98

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