What do the following items have in common?
The La Brea Tar Pits
A PIN number
The River Avon
Mount Fuji-yama
A hot water heater
Each of the items has a redundancy: The and La in La Brea Tarpits, the N in PIN is Number, Avon is the river (not like Mississippi which is a river and a state), yama means Mountain, and hot water is already heated so you just have to say water heater.