こく
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A samurai hits the foreheads of grains with his weapon so the grains will pop off and into his mouth. He doesn't want to kill the plants, so he's just skimming the grain's foreheads so they'll fall off and he can eat them.
Phew, all of this grain is making the samurai thirsty, so he reaches in his bag and pulls out an ice cold, refreshing Coke (こく).