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Fig. 1. Sound spectrogram of a part of a flight song of a male skylark. Each
syllable is labelled with a number (same syllables have the same number). A
phrase corresponds to a succession of at least three different syllables
repeated by the same individual or shared by different individuals. Here, the
phrase 1 is composed of syllables 3, 4, 5 and 6, and is repeated twice,
consecutively.