  Masses of heavy mesons, tetraquarks and pentaquarks computed in a potential
model are shown. Tetraquarks are studied as bound states of a diquark and an
antidiquark. Pentaquarks are constructed from a series of two-body interactions
between the four quarks and the antiquark. New results on $Qs\bar Q \bar q$ and
$QQ\bar Q \bar Q$ tetraquarks are also obtained.
