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Use "skulls" in a sentence
"Rolling 2 skulls is a disaster (Drought) which subtracts points from your score."
"Rolling 3 skulls is a worse disaster (Pestilence), Rolling 4 is even worse (an Invasion), etc."
"What Obam and his followers can't seem to get through their thick skulls is that the American taxpayer will pay for healthcare for anyone on a temporary basis."