You start from top to bottom.
And from left to right.
You first vibrate the first letter: DUUY, DUUY, DUUY; DUY, DUY, DUY; DOHY, DOHY, DOHY; THOHY, THOHY, THOHY; TUUY, TUUY, TUUY.
Then you blot that letter out and imagine as well how it is destroyed.
Then you vibrate the next letter (2nd...