(m + 15) + n = m + 15 + n
(m + 7) + n = m + 7 + n
(m + 48) + (n + 20) = m + 48 + (n + 20) = m + 48 + n + 20 = m + 68 + n
(m + 26) + (n + 14) = m + 26 + (n + 14) = m + 26 + n + 14 = m + 40 + n
m + (n + 9) = m + n + 9
(m + 30) + (n + 17) = m + 30 + (n + 17) = m + 30 + n + 17 = m + 47 + n
(m + 15) + n = m + 15 + n
(m + 7) + n = m + 7 + n
(m + 48) + (n + 20) = m + 48 + (n + 20) = m + 48 + n + 20 = m + 68 + n
(m + 26) + (n + 14) = m + 26 + (n + 14) = m + 26 + n + 14 = m + 40 + n
m + (n + 9) = m + n + 9
(m + 30) + (n + 17) = m + 30 + (n + 17) = m + 30 + n + 17 = m + 47 + n