class(d1,play).
class(d2,dont_play).
class(d3,dont_play).
class(d4,dont_play).
class(d5,play).
class(d6,play).
class(d7,play).
class(d8,play).
class(d9,play).
class(d10,dont_play).
class(d11,dont_play).
class(d12,play).
class(d13,play).
class(d14,play).