9base 9base is a port of various original Plan 9 tools for Unix, based on plan9port. It currently contains the following original (no source changes) shell commands from Plan 9 for Unix: ascii awk basename bc cal cat cleann

the program assumes that we have a raileay station, when the train leaves we denote that as (D), and when it enters we donote that as (E), so (ED) means that the train entered the station and then left, (EEDD) means that a train entered, another one