sd -- a drop-in replacement for `cd'

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| |      / /_  | | | || |__     ) || || |_ | |_) || |     
| |     | '_ \ | | | ||___ \   / / |__   _||  _ < | |     
| |____ | (_) || |_| | ___) | / /_    | |  | |_) || |____ 
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