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A gapped repeat is a factor of the form uvu where u and v are nonempty words. The period of the gapped repeat is defined as |u|+|v|. The gapped repeat is maximal if it cannot be extended to the left or to the right by at least one letter with preserving its period. The gapped repeat is called α-gapped if its period is not greater than α|u|. A δ-subrepetition is a factor whose exponent is less than...