func findMultipleIndexes(str, substr string) []int {
    var indices []int
    start := 0
    for {
        index := strings.Index(str[start:], substr)
        if index == -1 {
            break
        }
        indices = append(indices, start+index)
        start += index + 1
    }
    return indices
}
func Contains(M []int, Item int) bool{
    for _,v  := range M {
        if v == Item {
            return true
        }
    }
    
    return false
}
func gridSearch(G []string, P []string) string {
    // Write your code here
    const NO = "NO"
    const YES = "YES"

    if len(P) == 0 {
        return "NO"
    }

    row := -1
    // find the first line of patter match
    for i, v := range G {
        cols := findMultipleIndexes(v, P[0])
        for _, col := range cols {
            row = i
            // if next not lines available at the Group
            if row == -1 || col == -1 || len(G) < row+len(P) {

                // return NO
                continue
            }

            found := true
            // now check for next lines
            for j := row + 1; j < row+len(P); j++ {
                i := j - row
                ncols := findMultipleIndexes(G[j], P[i])
                if !Contains(ncols, col) {
                    found = false
                    break
                }
            }

            if found {
                return YES
            }
        }
    }

    return NO
}