Premise: Mandolin . There are many styles of mandolin , but three are common , the Neapolitan or round-backed mandolin , the carved-top mandolin and the flat-backed mandolin . The round-back has a deep bottom , constructed of strips of wood , glued together into a bowl . The flat-backed mandolin uses thin sheets of wood for the body , braced on the inside for strength in a similar manner to a guitar . Neapolitan mandolins feature prominently in European classical music and traditional music .
Hypothesis: There is only one style of the mandolin.
Label: CONTRADICTION