There are four big characters carved on the stone wall, the words Heaven and Cave have been recognized, what are the remaining two words? Please teach the big guys! A friend sent me a picture saying that he saw this picture online, in the picture

There are four big characters carved on the stone wall, the words Heaven and Cave have been recognized, what are the remaining two words? Please teach the big guys!

A friend sent me a picture saying that he saw this picture on the Internet, there is a large stone wall in the picture, the stone wall is engraved with four large characters, and the first and second numbers on the right have been recognized: heaven, hole. The remaining two words were not recognized. Let me help you see what words are carved on the stone wall. The attached photo is shown in the picture below.

I told him that the two words left on the stone wall were, from left to right: Other, Yes. The words on the stone wall are, from left to right: Don't have a hole in the sky.

Don't have a cave sky, which means that there is another world in the cave, describing the scenery as peculiar or the artistic creation fascinating. From "Questions and Answers in the Mountains".

Am I right? Please teach the big guys!