sp3-hybridization

//
//       _____ _____ ____        _    _       _          _     _ _          _   _
//      / ____|  __ \___ \      | |  | |     | |        (_)   | (_)        | | (_)
//     | (___ | |__) |__) |_____| |__| |_   _| |__  _ __ _  __| |_ ______ _| |_ _  ___  _ __
//      \___ \|  ___/|__ <______|  __  | | | | '_ \| '__| |/ _` | |_  / _` | __| |/ _ \| '_ \
//      ____) | |    ___) |     | |  | | |_| | |_) | |  | | (_| | |/ / (_| | |_| | (_) | | | |
//     |_____/|_|   |____/      |_|  |_|\__, |_.__/|_|  |_|\__,_|_/___\__,_|\__|_|\___/|_| |_|
//                                       __/ |
//                                      |___/