The USA does not use A-series paper sizes. It uses Letter (21.6 × 27.9 cm), Legal (21.6 × 35.6 cm), and Tabloid (27.9 × 43.2 cm) sizes. Most other countries use A-series sizes like A4 (21 × 29.7 cm), A3 (29.7 × 42 cm), and A5 (14.8 × 21 cm), which follow the ISO 216 standard.

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