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Clarification based on a question in a comment.
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zovits
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The Blacklist of sets containing Black Brick, Arch 1 x 5 x 4

Black Brick, Arch 1 x 5 x 4

(or its alternate version) and the Bluelist of sets containing Blue Slope 33 2 x 2 Double

Blue Slope 33 2 x 2 Double

has no common element, therefore these parts have never appeared together in an official set, so this one must be a custom creation.

The Black Brick, Arch 1 x 5 x 4

Black Brick, Arch 1 x 5 x 4

(or its alternate version) and the Blue Slope 33 2 x 2 Double

Blue Slope 33 2 x 2 Double

have never appeared together in an official set, so this one must be a custom creation.

The list of sets containing Black Brick, Arch 1 x 5 x 4

Black Brick, Arch 1 x 5 x 4

(or its alternate version) and the list of sets containing Blue Slope 33 2 x 2 Double

Blue Slope 33 2 x 2 Double

has no common element, therefore these parts have never appeared together in an official set, so this must be a custom creation.

Source Link
zovits
  • 17.3k
  • 3
  • 47
  • 89

The Black Brick, Arch 1 x 5 x 4

Black Brick, Arch 1 x 5 x 4

(or its alternate version) and the Blue Slope 33 2 x 2 Double

Blue Slope 33 2 x 2 Double

have never appeared together in an official set, so this one must be a custom creation.