Well, using my limited knowledge, "cleaving" means to chop, break in half, split, etc. Twain means twice. So, perhaps it's like "you've broke my heart in half", something along those lines? hopefully this helps you.
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c, "as these details have shown." is used when restating a point you already made
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Love ur enemy(it's a good example) ☺️
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★ KEY POINTS
I faced a kind of poverty for sometime.
2. I had no food to eat, no place to sleep.
3. I was all alone there.
4. I felt like a movie's scene, but that was much difficult in reality.
5. I was so tired.
6. But somehow, a man came and gave me lift in the end.
7. I was so much happy to reach my destination after a lot of difficulties.