{xa1−xb1≤y1xa2−xb2≤y2⋯xam−xbm≤ym \begin{cases} x_{a_1}-x_{b_1}\leq y_1 \\x_{a_2}-x_{b_2} \leq y_2 \\ \cdots\\ x_{a_m} - x_{b_m}\leq y_m\end{cases}⎩⎨⎧xa1−xb1≤y1xa2−xb2≤y2⋯xam−xbm≤ym
