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7 pagkat 2 satuannya 9
7 pangkat 3 satuannya 3
7 pangkat 4 satuannya 1
7 pangkat 1234 + 7 pangkat2341 + 7 pangkat3412 + 7 pangkat4123
...1 + ... 7 + ...9 + ....3 = ...20
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