a sequence square bracket regular insert symbol 1 regular mathematical expression for example sequence regular time irregular Draw give sequence minimalistic pseudographics strip low possible height use symbol for example sequence represent each bracket represent hepl symbols vertical symbol example give abovebrackets draw space divide pair consecutive pairwise bracket singlespace bar bracket visually merge symbol the image minimum possible height the enclosed bracket small surround bracket bracket separately strive maximize height image so pair final bracket example occupy entire height imagestudy carefully example adequately explain condition problem pay attention problem answer image unique