The handler module is the coordination layer between the UI and the Haskell runtime. It automatically re-executes code blocks when inter-cell dependencies change thus ensuring that the notebook state remains consistent. Put simply when a cell is changed we need to update all its dependencies. Cell A depends on cell B if A uses anything that b defines. The handler module runs a series of steps to make this possible.
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第九条 船舶由两个以上的法人、非法人组织或者自然人共有的，应当向船舶登记机关登记；未经登记，不得对抗善意第三人。