(t+s)+(-p-m)
t+s-p-m
(m-n)-(k-t)
m-n-k+t
(a-b)+(c-d)
a-b+c-d
(x+y)-(z+t)
x+y-z-t
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(t+s)+(-p-m)
t+s-p-m
(m-n)-(k-t)
m-n-k+t
(a-b)+(c-d)
a-b+c-d
(x+y)-(z+t)
x+y-z-t