The diagram shows the net of a cube, that is, we can fold along the edges of the squares to
make a cube from this net. On each face there is an integer written - $$1,a,b,c,d,2026$$. Each of the four numbers $$a,b,c,d$$ equals the average of the numbers on the four faces of the cube adjacent to it, The value of $$a$$ is
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