for test in range(eval(input())):
    x,y,n,k=map(int,input().split())
    flag=0
    for i in range(n):
        p,c=map(int,input().split())
        if (x-y)<=p and c<=k:
            flag=1
    if(flag):
        print("LuckyChef")
    else:
        print("UnluckyChef")
    test+=1    
            
            
    

4d5e89be2f147c33ff0d2f70d4ece5231a460a06
<mask token>

for test in range(eval(input())):
    x, y, n, k = map(int, input().split())
    flag = 0
    for i in range(n):
        p, c = map(int, input().split())
        if x - y <= p and c <= k:
            flag = 1
    if flag:
        print('LuckyChef')
    else:
        print('UnluckyChef')
    test += 1

for test in range(eval(input())):
    x,y,n,k=map(int,input().split())
    flag=0
    for i in range(n):
        p,c=map(int,input().split())
        if (x-y)<=p and c<=k:
            flag=1
    if(flag):
        print("LuckyChef")
    else:
        print("UnluckyChef")
    test+=1    
            
            
    
