In ‘639’ and ‘657’ there is 6 in common, and ‘is’ is common in ‘wood is hard’ and ‘fur is soft’ so “is” = 6. In ‘657’ and ‘135’ there is 5 in common, and “soft” is common in ‘wood is hard’ and ‘fur is soft’ so “soft”= 5. In ‘639’ and ‘135’ there is 3 in common, and “hard”is common in ‘wood is hard’ and ‘fur is soft’ so “hard”= 3. In 135, 3 = “hard” and 5 = “soft”, then 1 would mean “or”.