n=int(input()) l=[] for i in range (n): t=int(input()) l.append(t) for i in l: x=1 y=i for j in range (1,i+1): for k in range (1,i+1): if k==x and k==y: print("X") break if k==x: if x>y: print("X") break print("X",end="") continue if k==y: if y>x: print("X") break print("X",end="") continue print("",end=" ") x+=1 y-=1 print("")