https://chessdatabase.science/....wiki/Adding_a_Compos
A cat flap is a tiny door that lets your pet enter and leave the house whenever they like. It can be placed in windows, doors and even in walls. It is opened when your cat pushes an area of their body through it. Microchip cat flaps recognise the unique microchip of your cat to unlock the door. Infrared and magnetic cat flaps require your cat to wear a collar equipped with either a magnet or an infrared device that will activate the flaps. What is a flap for a cat? A cat flap is a tiny opening in the door or window tha
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