small optimization
small optimization

you can use 2 dots in for in loop to except dimension value

yujiaao/swift-2048,kasperpeulen/swift-2048,machelix/swift-2048,sanvital/swift-2048,shixingbang/swift-2048,blackwoof/swift-2048,SuPair/swift-2048,kiurentu/swift-2048,nanthi1990/swift-2048,Alexzhxy/swift-2048,luzefeng/swift-2048,austinzheng/swift-2048,longjl/swift-2048,digomes87/swift-2048,HuylensHu/swift-2048,SampleLiao/swift-2048,dx285/swift-2048