Daily Feline Prompt: Automatic Feline

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Being a feline, I have a tail
It follows me over hill and dale
Sometimes it curls, sometimes it is straight
It is always there, my faithful mate
I cannot control it, it does what it will
Although it depends on the way that I feel
If I am happy it is upright and tall
If I am miserable it is hard to install
The secret of the mood swings is a delicate trick
It lays in the secrets of quantum mathematic

Daily Feline Prompt: Automatic Feline