Scalable Topological Sort

You receive N lines of raw text describing task dependencies,
e.g.,
'A after B',
'C->A',
'B before D'.
Implement a function that:
- parses the strings into a graph;
- handles duplicate/unknown tasks and invalid inputs gracefully;
- returns one valid topological order of tasks;
- detects cycles.
Analyze time and space complexity.
...




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