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Entres a una sala d'assaig i et trobes que la partitura que s'ha d'interpretar, en lloc d'estar als faristols, està repartida per les parets. Vas recorrent amb la mirada la sala i descobreixes tots els fragments d'aquesta peça i a continuació, sens dubte, et preguntes quin és el primer fragment que has d'interpretar i cóm has de continuar després. En eixe moment entra en acció un personatge situat al centre de la sala que està explicant precisament que en aquesta peça els fragments es poden interpretar en qualsevol ordre seguint una única restricció: no es poden interpretar de manera consecutiva dos fragments que comencen amb la mateixa nota o amb dues notes fent octava. En interpretar l'obr
