Instruct: Given a premise, retrieve a hypothesis that is entailed by the premise.
Query: How to replace an empty ink cartridge<br>Write down the printer brand and model number. You will need to know both in order to find the correct replacement ink cartridges. If you can't find the model number, check the documentation that came with your printer.
The model number could be on the paperwork that came with the printer.
Call the manufacturer directly and ask someone if they have the part
Printers malfunction too much
The printer at the library was newer
Printers are known to malfunction often
You need to have your rifle available when you contact the manufacturer. 
The manufacturer will connect you with an experienced representative to determine the correct action for your rifle. 
Fine print could have been read.
The lamp had to be replaced.
Go to your local auto parts store to see if they have it
Use a number 2 pencil
The author had misplaced their pen earlier. 
The instructions are missing steps.  
The ink in the newspapers is colored
Items can be purchased on Serial Killers Ink.
If you have the wrong fuel in the tank, you need a mechanic.
The company representative will suggest more than one model as a correct action for your rifle. 
The author searched the desk for a pen. 
Contacting the manufacturer won't help you find out what kind of padlock you have.
The holding tray needs to be purchased separate.
This is directions on how to change the oil filter in your car. 
Ink got of the floor.
If you don't know the ink cartridge brand you need you can replace it with another model number and brand.
The ink cartridge will run out quickly from new. 
The ink cartridge will cost more than the printer did. 