for ii in range(int(input())):
	segs = {}
	N=int(input())
 
	for k in range(N):
		X=input().split()
		L=int(X[0])
		R=int(X[1])
		V=X[2]
		fault=0
		if(V not in segs):
			segs[V]=[[[L,R]],1]
		else:
			flg1=0
			for i in range(0,len(segs[V][0])):
				if(segs[V][1]==3):
					fault=1
					break
				if(R<segs[V][0][i][0] or L>segs[V][0][i][1]):
					continue
				else:
					if(L<segs[V][0][i][0]):
						if(R>segs[V][0][i][1]):
							segs[V][0][i][0]=L
							segs[V][0][i][1]=R
						else:
							segs[V][0][i][0]=L
					else:
						if(R>segs[V][0][i][1]):
							segs[V][0][i][1]=R
					segs[V][1]+=1
					flg1=1
 
			if(flg1!=1):
				segs[V][0].append([L,R])
			if(fault==1):
				break
	if(fault==1):
		print("NO")
	else:
		print("YES")

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Mgo0CjUgNyAyCjQgNiAxCjEgNSAyCjYgOCAxCjQKMSAyIDEKMSAyIDEKMSAyIDEKMSAyIDE=

2
4
5 7 2
4 6 1
1 5 2
6 8 1
4
1 2 1
1 2 1
1 2 1
1 2 1