Now compare (keya : vala) with (keyb : valb)
Now compare (keyb : valb) with (keyc : valc)
Now compare (keyc : valc) with (keyd : vald)
Now compare (keye : vale) with (keyf : valf)
Now compare (keyf : valf) with (keyg : valg)
Now compare (keyg : valg) with (keyh : valh)
Now compare (keyi : vali) with (keyj : valj)