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Very interesting idea

Curiously....

It is remarkable, very valuable piece

Curiously, and the analogue is?

Bravo, seems brilliant idea to me is

Bravo, what phrase..., a magnificent idea

Without variants....

I congratulate, your idea is brilliant

I congratulate, remarkable idea and it is duly

I can speak much on this theme.

I apologise, but, in my opinion, it is obvious.

From shoulders down with! Good riddance! The better!

The authoritative answer, curiously...

I better, perhaps, shall keep silent