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 flat-backed mandolin uses thin sheets of wood for the body , braced on the inside for strength in a similar manner to a guitar . Flat-backed instruments are commonly used in Irish , British and Brazilian folk music .
Hypothesis: One style of the mandolin is the flat-backed mandolin.
Label: ENTAILMENT