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QUICK ANSWER
"Que lo que" is a form of "que lo que", a phrase which is often translated as "that what". "De lo que" is a phrase which is often translated as "of what". Learn more about the difference between "que lo que" and "de lo que" below.
que lo que(
keh
loh
keh
)A phrase is a group of words commonly used together (e.g., once upon a time).
de lo que(
deh
loh
keh
)