LECON NR 4 LETTRES Z U B  EXERCICE NR 3 = TANRI  KDXMC GIUBZ  GUXCE  TZBUA  RKANU  IAETC  DKNUR  RIGCZ  BICGA  XCUMD  XDEAN  TIGCX  ZUIGB  XDCNR  KXNUB  ZDKZR  ATEKN =