I can see you have many problems.Names that make sense make a lot more sense
I will try and help.
Put it this way, we don't use words like 'Brad', 'Chuck', 'Junior', or 'Rocky' as people's names as we know they are variously nouns and adjectives (don't worry about it) but we learn them just to please, and "get along with you folks" (which we don't use either), it just helps us all help, and understand, each other.
OK, the post you refer to goes like this:
As you know a Cricket has six legs, so a semi-Cricket has three legs: a semi-cricket-triplet as we call it actually.
Now, (keeping up?) it just so happens that the game of cricket uses three stumps at each end of the 'runway' (as we call it) making six in total, so here again, we see that the semi-cricket is three stumps, which we also call a semi-cricket-triplet.
The confusing thing here is that we (us over here) often get legless AFTER we get stumped. Whereas you'd think it should be the other way around wouldn't you? (don't worry about it).
Either way - whether it's legs (off or otherwise) or just stumps (always off) there are always six in total in the above two examples and two semi-cricket-triplets always add up to a whole one, which is six.
Does that help?
If not, don't worry about it.
Deric.
Ps. Maybe it's a cultural difference thing (I don't know) but, personally, I find it much easier, not to mention quicker, to write and/or say 'hemi-semi-demi-quaver' than '64th'.