What is written on the six rows of hard pen calligraphy practice paper?

If you are writing regular script, it is recommended to write poetry. Write more of that statement, such as Autumn Night in the Deep Mountains by Wang Wei. Pay attention to the arrangement when writing, and you don't need to occupy a column for each sentence.

If you are writing a running script, writing words is better and easier to arrange, such as Su Shi's Red Cliff Nostalgia.