IOW, the 613 were condensed to the 10 Commandments?
There is a midrash which states that the whole of the Torah is contained in the Ten Commandments. Further, the Ten Commandments are contained in the the First Commandment: I am the LORD your God, who brought you out of the land of Egypt, out of the house of bondage. The first commandment is contained within its first word: anokhi. The word anokhi is contained within its first letter, aleph. And the letter aleph is silent.