今有a,b,c,d,e,g共7人,已知下列事实: a会讲法语;b会讲法语、意大利语和日语;c会讲法语、汉语;d会讲日语和意大利语;e会讲德语、汉语和法语;f会讲英语、日语和俄语;g会讲英语和德语。试问:这7个人应如何围圆桌排座位,才能使每个人和他两边的人可以交谈?(须写出所有可能方案)
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