{x}=x+1
{x,y}={x-1,{x-1,{...{x-1,y}...}(y对大括号)
{0
#} # 是一段数字序列
{a1,a2,a3,...,an,x}(a1,a2,...,an≥1)
={a1,a2,a3,...,an-1,{a1,a2,a3,...,an-1,{...{a1,a2,a3,...,an-1,x}...}(x对大括号)
{a1,a2,a3,...,am,0,0,...,0,x}(a1,a2,a3,...,am≥1)
={a1,a2,a3,...,am-1,x-1,x-1,...,x-1,x}
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