Suppliers that have offered catalyst for coal applications in the past but currently focus strictly on gas and oil -fired applications were not included.
The requirements were widened to include suppliers who made coal catalyst in the past but now focus on gas and oil.
mnli hypothesis: The requirements were widened to include suppliers who made coal catalyst in the past but now focus on gas and oil. premise: Suppliers that have offered catalyst for coal applications in the past but currently focus strictly on gas and oil -fired applications were not included.