Added the denoising field pdf files.

diff --git a/denoising_field_penta.pdf b/denoising_field_penta.pdf
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diff --git a/denoising_field_spiral.pdf b/denoising_field_spiral.pdf
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index 0000000..6f59f13
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diff --git a/denoising_field_zigzag.pdf b/denoising_field_zigzag.pdf
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index 0000000..30dbf13
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