__                                         __  
 / /____ ___  ___ ___  ____ _    _____  ____/ /__
/ __/ -_) _ \(_-</ _ \/ __/| |/|/ / _ \/ __/  '_/
\__/\__/_//_/___/\___/_/ (_)__,__/\___/_/ /_/\_\ 
Don't be so tense.
Source: http://labs.bio.unc.edu/harris/Courses/biol104/tensors.htm
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last update 03.01.2016