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Further, the data used to illustrate household expenditure on water supply and sanitation services is classified under the Harmonized Indices of Consumer Prices (HICP) data category “Water Supply and Miscellaneous Services related to the Dwelling”. This aggregates the subcategories “Water Supply”, “Refuse Collection”, “Sewerage Collection”, and “Other Services Relating to the Dwelling, Not Elsewhere Classified” and thus carries an associated error.