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When a new task is received, the main expression is evaluated to produce a task tree.
A task tree is a tree structure in which each node represents a task combinator and the leaves are basic tasks.
-If a task is not initialized yet, i.e.\ the pointer to the current task tree is still null, the byte code of the main function is interpreted.
+If a task is not initialised yet, i.e.\ the pointer to the current task tree is still null, the byte code of the main function is interpreted.
The main expression always produces a task tree.
Execution of a task consists of continuously rewriting the task until its value is stable.