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diff --git a/content/know/concept/multi-photon-absorption/index.pdc b/content/know/concept/multi-photon-absorption/index.pdc
index b208cfe..a5f4ad7 100644
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+++ b/content/know/concept/multi-photon-absorption/index.pdc
@@ -4,6 +4,7 @@ firstLetter: "M"
publishDate: 2022-01-30
categories:
- Physics
+- Optics
- Quantum mechanics
- Nonlinear optics
- Perturbation