YOU SAID:
They already have Y within X
INTO JAPANESE
彼らはすでにXの中にYを持っています
BACK INTO ENGLISH
They already have Y in X
INTO JAPANESE
彼らはすでにXにYを持っています
BACK INTO ENGLISH
They already have Y to X
INTO JAPANESE
彼らはすでにYからXを持っています
BACK INTO ENGLISH
They already have Y to X
That didn't even make that much sense in English.