No, they don't. You can buy them as sets, or you can buy them separately if you prefer, or buy only one or the other.
Not always, a lot of times women's pajamas will come in separates. They usually come in sets during holiday months when they are in gift sets.
Flatwear can come in many varieties, from as small as 3 piece sets, to much much larger.
all good things always come to an end
No, only if both sets are empty. The intersection of disjoint sets is always empty.
No.
Yes each sets come with its own size bed that fit the frame of the sets
It is because of the myth of werewolves, like how they come out at a fullmoon
Some things that come in sets are:bookscoffee servicedishesfurnitureglasses (for drinking*)knivesmoviespots & pansrecordssheetsshelvesstationerystemwaretea servicetires*eyeglasses come in pairs
Are the closures and interiors of connected sets always connected, or the set of interior points? The Answer: No. There isn't always a connection inside connected sets.
The best place to find a full sized headboard for your bed is at your local furniture store. Many stores have online catalogs, also and offer free delivery with a certain purchase requirement.
No, they do not.
If you look around for different brands you will be able to find sets that come with both the table and the umbrella. Usually, they will sell them separately but if you search at warehouses like Costco or BJ's, they will often have them in sets or even if they sell them separately they will be a little cheaper than other retail stores.