playtennis(overcast, hot, high, weak) = yes,
playtennis(rain, mild, high, weak) = yes,
playtennis(rain, cool, normal, weak) = yes,
playtennis(overcast, cool, normal, strong) = yes,
playtennis(sunny, cool, normal, weak) = yes,
playtennis(rain, mild, normal, weak) = yes,
playtennis(sunny, mild, normal, strong) = yes,
playtennis(overcast, mild, high, strong) = yes,
playtennis(overcast, hot, normal, weak) = yes