i have to make trihybrid cross of 46 square ?

In sweet corn large kernels are dominant over small, tall stalks and short stalks show incomplete dominance, and brown leaves are co-dominant with green leaves. Show the Punnett Square for a cross between two heterozygous plants. (parents would be have large kernels, medium stalks, and spotted leaves) Tell me the phenotypes of the offspring. You will need a Punnett Square with 64 boxes.