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- Sample data -
- A:Alpha->B:Beta->C:Beta->D:Alpha
- A:Alpha->M:Beta->Z:Gama->P:Beta->D:Alpha
- A:Alpha->S:Beta->F:Beta->I:Beta-->D:Alpha
- A:Alpha->U:Beta->X:Alpha->T:Alpha->W:Beta->D:Alpha
- Result should be -
- A:Alpha->B:Beta->C:Beta->D:Alpha
- A:Alpha->S:Beta->F:Beta->I:Beta-->D:Alpha
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