The sentence is in stock

To be a writer you must buy a block
Then you need a pen and paper both.
I don’t what my shops have in stock

You have no right to find another dock
So stand in court  and take a solemn oath
To be a writer you must buy a block

Quickly  stir your dinner in a wok
For brains need food when energy falls low
I don’t what omens are in stock

You might need more paper, hire a truck
Fill it up with reams  of  stuff in rows
To be a writer you must buy a block

Once you write a line, you’re  called unstuck
To its fellows you must be the host.
I don’t what  sentences we stock

The sentences must run out  unenforced
And between them we ignite  further words
To be a writer you must buy a block
Just see what  the Bailey’s got ad hoc