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Quick Summary
Manage multiple data streams in the exact order they were added.
Support dynamic addition and removal of streams during runtime.
Read up to N characters sequentially across active streams, skipping exhausted ones.
What This Tests
Object-oriented design and encapsulation
State tracking and cursor management
Handling edge cases and early termination conditions
Iterative control flow with mutable collections
Common Patterns
Design
State Tracking
Iterator Pattern
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