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Sääntö
Muodosta sanallinen sääntö, joka kertoo, miksi luvuksi luku [i]x[/i] muuttuu, kun se raahataan putken läpi.
Ilmoita sääntö seuraavassa muodossa:
Kun luku [i]x[/i] raahataan putken läpi, siitä tulee luku …