Since all letters in a sentence are different words and dependent nouns, it is correct to space them all (principle)
2)
In principle, everything should be written with spaces, but according to ‘Article 46 of the Korean spelling regulations’
When single-syllable words appear in succession, it is necessary to understand the meaning.
Exceptionally, it is okay to use ‘white light’, ‘four’, ‘two’, and ‘several’.
3)
In the case of main verb + auxiliary verb, such as ‘sawa’, the principle is to use a space, but
In some cases, it may be added (Article 47)
Spelling is difficult…