You are given a $0$ indexed $m \times n$ binary matrix land where a value of $0$ represents a non farmland cell and a value of $1$ represents a farmland cell.

Farmland cells are organized into rectangular groups. A group of farmland is defined as a maximal rectangle of adjacent $1$ values such that no two groups share a border.

Every group of farmland can be uniquely represented by a $4$ element list $[r_1, c_1, r_2, c_2]$, where $(r_1, c_1)$ represents the top left coordinate and $(r_2, c_2)$ represents the bottom right coordinate of the rectangle.

Return a $2$D array containing the coordinates $[r_1, c_1, r_2, c_2]$ for every group of farmland in land. The groups may be returned in any order.

Constraints:

• m $==$ land.length

• n $==$ land[i].length

• $1 \leq$ m, n $\leq 300$

• land consists of only $0$’s and $1$’s.

• Groups of farmland are rectangular in shape.

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