n=int(input())
for i in range(n):
    k,s,l=input().split()
    k=int(k)
    q=0
    s1=s
    l1=l
    e1=len(s)
    e2=len(l)
    min1=min(e1, e2)
    max1=max(e1, e2)
    for i in range(min1):
        if s[i]!=l[i]:
            break
        else:
            s1=s[i+1:e1]
            l1=l[i+1:e2]
            #print(s1,l1)
    q=len(s1)+len(l1)
    #print(q)
    if q==k or (k-q)%2==0 and (k-q)>0:
        print('Yes')
    else:
        print('No')