I bought this astonishing, climbing plant months ago, but I wasn't able to identify it.
Here's a picture:
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That looks like a clitoria ternata. The wiki page says:
Clitoria ternatea, common names including butterfly pea, blue pea, Cordofan pea and Asian pigeonwings, is a plant species belonging to the Fabaceae family. The flowers of this vine have the shape of human female genitals, hence the Latin name of the genus "Clitoria", from "clitoris".