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