How to make a trihybrid test cross?

I need help making a trihybrid test cross for two individuals who are each heterozygous for earlobes (dominant E, recessive e); PTC tasting (dominant T, recessive t); and tongue rolling (dominant R, recessive r). Also, what would the ratios of all possible genotypes and phenotypes be? I get that there's 64 boxes in the punnett square, but that's as much as I have to go on. Thanks!