Consider some of the more obscure tests that implementations must pass:
英國商會（BCC）估計，15%的關稅稅率上調將使英國出口到美國的商品關稅成本增加20億至30億英鎊（27億至40億美元）。
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Apple and Netflix are teaming up to share Formula 1 programming
The research, based on citizen science surveys led by the Bat Conservation Trust, estimates that half of all churches in England - that's more than 8,000 - have bats in them.
输入：head = [2,1,5]