In this problem you will model a simple block world under certain rules and constraints.

在这个问题中，你将在确定的规则和约束条件下构建一个简单的积木世界。

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For example, an early AI study of planning and robotics (STRIPS) used a block world in which a robot arm performed tasks involving the manipulation of blocks.

比如在早期的规划学和机器人学的人工智能研究就利用一个积木世界，让机械臂执行操作积木的任务。

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Lined with about a dozen 18th century homes, Little Green Street only stretches a city block in length, but has survived the Blitz in World War II and three centuries of construction.

街两边有十几家18世纪的房屋，小格林街仅有一个城市街区的长度，但却从二战的大规模空袭和三个世纪来的反复建设中幸存下来。

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LONDON, England -- There is a new kid on the block in the world of portable listening devices -- the mp3blue jacket.

CNN: Something clever up your sleeve

The Gates Foundation is the biggest malaria funder on the world block, but it's trying to cooperate with the other players as well.

FORBES: Magazine Article

They listened to me - not because I was British, but because I represented the largest single economic block in the world of 475 million people.

BBC: The Speaker must go