fun no() = println("NO")

fun readData() {
    val lines = readln().toInt()

    var i = 0;
    for (i in 1..lines) {
        val params = readln().split(" ").sortedBy { -it.length }
        val n = params[0].toInt()
        val a = params[1].toInt()
        val b = params[2].toInt()
        val ab = params[1] + params[2]

        if (n != a * b) {
            no()
//            println("a")
            continue
        }

        if (params[1].length != params[2].length) {
            no()
//            println("b")
            continue
        }

        if (a % 10 != 0 && b % 10 != 0) {
            no()
//            println("c")
            continue
        }

        val map = mutableMapOf<Char, Int>()
        ab.forEach {
            if (map.containsKey(it)) {
                map[it] = map[it]?.plus(1) ?: 0
            } else {
                map[it] = 1
            }
        }
        params[0].forEach {
            if (map.containsKey(it)) {
                if(map[it]!! > 1) {
                    map[it] = map[it]?.minus(1) ?: 0
                } else {
                    map.remove(it)
                }
            } else {
                no()
            }
        }

        if (map.isNotEmpty()) {
            no()
//            println("d")
            continue
        }
        println("YES")
    }
}

fun main() {
    readData()

}
class Vampires {
 
}