Strawberry store only sells strawberries, not selling toasts.
Toast store sells toasts, strawberry toasts, and pear toasts.
You go to a strawberry store to buy strawberry toasts,
the salesman says:"We don't have toasts, you shall go to a toast store."
Then you go to the toast store, asking for a pear toast,
the salesman says:"Do you want a strawberry toast, or a pear toast?"
you say:"Pear toast."
So the salesman made a strawberry toast for you.
You say:"I want the pear toast, not strawberry toast."
the salesman made a pear toast for you instead.
Are you kidding me, why a pear toast would have strawberry jam?
you ask:"Why this pear toast has strawberry jam?"
The salesman says:"The pear toasts in our store would have few strawberry jam for flavoring.
you say:" Is this strawberry toast or pear toast?"
the salesman says:" Pear toast, but with strawberry jam added."
you say:" Damn I just want pure pear toast."
the salesman says:"For pure pear toast, you have to purchase at the pear store, but pear store only sells pears, which don't sell toast."
you say:" Damn it has to be done by yourself?"
the salesman says:"Yeah, you buy pears, then go to toast store to buy toasts, do it by yourself."
So you go to pear store to buy pears, then toasts store to buy toasts.
However when you come back to home, you find out that you mistaken buying strawberries--because you wrongly went to the strawberry store.
you sigh:"Strawberry store, toast store, pear store, which drives my head aching, eventually we all just eat pineapple buns instead."
