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We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.18. Os.path.dirname (path)--return file path玉米这小子也察觉到爹娘爷奶神情不对劲，变乖巧了许多，不敢再动不动就吵闹。警视厅搜查一课长第三季杉咲花がTBS系連続ドラマ[花のち晴れ~花男 Next Season~]4月放送の火曜日午後10時で主演を務める。共演は平野紫耀、中川大志。映画、ドラマの[花より男子]のその後を描く。The above example show that that default policy for the FORWARD chain in the filter table is set to ACCEPT