Sequence

10cm x 15cm, 3.9inches x 5.9inches 21cm x 30cm, 8.3inches x 11.8inches 30cm x 45cm, 11.8inches x 17.7inches 40cm x 60cm, 15.8inches x 23.6inches 50cm x 75cm, 19.7inches x 29.5inches

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