Words similar to 대여섯?

There are actually words like this all the way to at least 8:

• 한두, 한둘: 1 or 2
• 두세, 두셋: 2 or 3
• 서너, 서넛: 3 or 4
• 네댓, 네다섯: 4 or 5
• 대여섯: 5 or 6
• 예닐곱: 6 or 7
• 일여덟: 7 or 8

In each case, the two numbers are compounded, with the first one reduced to just one syllable. In some cases, a contraction seems to have altered the first syllable - as in 대여섯 and 예닐곱 - but I'm not sure the mechanism that brought about this sound change.