Many years ago I was taught Young tableau but I can't for the life of me remember how to do it, but now I seem out of the blue to need a Clebsch decomposition! Does anyone who is nifty at these things know what the decomposition of 3x3x3x3x3* is in SU(3)? (FWIW, the reason I'm asking this is because I'm reading one of Gell-Mann's first papers on the quark model, and he contemplates whether we could consider baryons to be made up of four quarks and an anti-quark. Now I'm wondering how the baryonic world would be different if they were!) Thanks guys!