Task: unclog a sink
Assumptions:
Unclog a sink with plunger.
Steps:
Remove all water from the sink.
Fix the sink overflow.
Use a cloth to cover the floor.
Make the plughole clean.
Put the plunger's bottom over the plughole.
Press down firmly.
Run the faucets for a short while.
Hold the plunger handle firmly in both hands.
Pump the plunger continuously.