Is it grammatically permissible by the rules of Standard English for the coordinating conjunction ‘yet’ to follow a subordinating conjunction? For example, take the sentence:
Although it is early, yet still I must rise.
This seems to make sense and be correct to me, but if I substitute another coordinating conjunction, say ‘but’, it no longer seems so:
Although it is early, but still I must rise.
It seems that the semantics of ‘but’ are what create a problem here, though instead of the grammar, but I can't seem to form any valid subordinating + coordinating sentence except if I use ‘yet’, so I'm not sure.