 The three Hu brothers worked together to collate a student primer on poetry by their contemporary Ye <unk> , which was called simply the Discussion of Poetry ( Shi Tan , <unk> ) ( 1635 ) . Other works on poetry from the studio included Helpful Principles to the Subtle <unk> of Selected Tang Poems ( <unk> Tang Shi <unk> <unk> , <unk> ) , which was a compilation of several works on poetry and included <unk> by Hu <unk> himself . 
