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tokens: ACKNOWLEDGEMENTS We thank the referee for a prompt and constructive report, and Matt Auger, Vasily Belokurov, Sergey Koposov, Xianzhong Zheng, and Cameron Lemon for helpful discussions. YS has been supported by the National Natural Science Foundation of China (No. 11603032 and 11333008), the 973 program (No. 2015CB857003), and the Royal Society – K.C. Wong International Fellowship (NF170995). RMC and IPF have been supported by the Spanish research grants ESP2015-65597-C4-4-R and ESP2017-86852-C4-2-R.