LECON NR 7 LETTRES H Q P  EXERCICE NR 3 = QHSVY  OWPHZ  IGHPX  QTANP  EHSIP  YVQPI  ENKQP  TNOCE  XYKRP  UXWHQ  DZUBP  MXCTH  QCNRP  ZCNYS  HUIEQ  TIQZB  GUHPX  QTCDR =