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The last Ayat of the previous Surah al-Isra begins with, "And say, "Praise to Allah...." [17:111] - and then Surah al-Kahf begins with "[All] praise is [due] to Allah, who has sent down upon His Servant the Book....." [18:1] - The begining of this Surah is an enactement from the instruction to say, Alhamdulillah from the last Ayat of the previous Surah.