Concrete - A solid material composed of cement, water, and aggregates, Draught - A current of air in an enclosed space, Excavation - The act or process of digging or removing earth, rock, Considerable - Significant in size, amount, or degree; noteworthy or substantial, Ample - More than enough or abundant; sufficient in quantity, Leisurely - In a relaxed or unhurried manner, allowing for enjoyment and comfort,

upstream b2+ unit 4

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