import sys
input = sys.stdin.readline

T=int(input())
for tests in range(T):
    N=int(input())

    R=[]
    G=[]
    B=[]

    for i in range(N):
        x,y=input().split()
        y=int(y)
        if x=="R":
            R.append(y)
        elif x=="G":
            G.append(y)
        else:
            B.append(y)

    if R==[] and G==[]:
        print("YES")
        continue

    if R==[] and B==[]:
        print("YES")
        continue

    if G==[] and B==[]:
        print("YES")
        continue

    if R==[]:
        if set(G) & set(B)!=set():
            print("YES")
            continue
        else:
            print("NO")
            continue

    if G==[]:
        if set(R) & set(B)!=set():
            print("YES")
            continue
        else:
            print("NO")
            continue

    if B==[]:
        if set(R) & set(G)!=set():
            print("YES")
            continue
        else:
            print("NO")
            continue

    RG=set(R) & set(G)
    GB=set(G) & set(B)
    BR=set(R) & set(B)

    if len(RG)>0:
        if len(GB)>1:
            print("YES")
            continue
        elif len(GB)==1:
            x=list(GB)[0]

            if x in RG:
                if len(G)==1:
                    print("YES")
                    continue
            else:
                print("YES")
                continue

        if len(BR)>1:
            print("YES")
            continue
        elif len(BR)==1:
            x=list(BR)[0]

            if x in RG:
                if len(R)==1:
                    print("YES")
                    continue
            else:
                print("YES")
                continue

    if len(GB)>0:
        if len(RG)>1:
            print("YES")
            continue
        elif len(RG)==1:
            x=list(RG)[0]

            if x in GB:
                if len(G)==1:
                    print("YES")
                    continue
            else:
                print("YES")
                continue

        if len(BR)>1:
            print("YES")
            continue
        elif len(BR)==1:
            x=list(BR)[0]

            if x in GB:
                if len(B)==1:
                    print("YES")
                    continue
            else:
                print("YES")
                continue

    if len(BR)>0:
        if len(RG)>1:
            print("YES")
            continue
        elif len(RG)==1:
            x=list(RG)[0]

            if x in BR:
                if len(R)==1:
                    print("YES")
                    continue
            else:
                print("YES")
                continue

        if len(GB)>1:
            print("YES")
            continue
        elif len(GB)==1:
            x=list(GB)[0]

            if x in GB:
                if len(B)==1:
                    print("YES")
                    continue
            else:
                print("YES")
                continue

    print("NO")