x = y <==> {...(n)...{x}...(n)...} = {...(n)...{y}...(n)...}
x = y <==> }...(-n)...}x{...(-n)...{ = }...(-n)...}y{...(-n)...{
x = y
{...(n)...{x}...(n)...} = {...(n)...{y}...(n)...}
}...(-n)...}{...(n)...{x}...(n)...}{...(-n)...{ = }...(-n)...}{...(n)...{y}...(n)...}{...(-n)...{
x = y
x = y
}...(-n)...}x{...(-n)...{ = }...(-n)...}y{...(-n)...{
{...(n)...{}...(-n)...}x{...(-n)...{}...(n)...} = {...(n)...{}...(-n)...}y{...(-n)...{}...(n)...}
x = y
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