import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

def check(f):
    if len(f) == 0:
        return True
    B = 0
    for i in range(f[0] is None, len(f) - (f[-1] is None)):
        if f[i] < 0:
            B += -f[i]
        else:
            B -= f[i]
        if B < 0:
            if not (f[0] is None):
                return False
            else:
                B = 0
    if B > 0 and not (f[-1] is None):
        return False
    return True


for _ in range(ni()):
    n, k, x = na()
    h = na()
    b = [h[i+1]-h[i] for i in range(n-1)]
    ans = 1
    for i in range(k):
        f = []
        for j in range(i, n + 1, k):
            if j == 0:
                f.append(None)
            elif j == n:
                f.append(None)
            else:
                if b[j-1] % x != 0:
                    ans = 0
                f.append(b[j-1] // x)
        ans &= check(f)
        #print(f, check(f))
    if ans:
        print("Yes")
    else:
        print("No")