Canon III at the fourth by contrary motion

In a canon at the 4th, the imitation is performed at the distance of a perfect 4th. In this canon the imitation is also by contrary motion (an ascending interval is transformed in a descending and vice versa).

Let's take as example the first two bars of our canon. The first four ascending seconds are transformed in descending seconds and the ascending 4th in descending 4th:

Here is the canon written in one stave. To see and listen the canon at two voices and understand how can we read it, click on the music:

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