text:  The three Hu brothers worked together to <unk> a student <unk> on poetry by their contemporary <unk> <unk> , which was called simply the <unk> of Poetry ( Shi Tan , <unk> ) ( <unk> ) . Other works on poetry from the studio included <unk> <unk> to the <unk> <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 . 
  