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+## Homework 2
+/^[^abek][^gmkb]\wfe$/
+
+## Homework 3
+/^c[^h]\w*te$/
+
+## Homework 4
+/^\w*(sign|ect|sis)+(?!\w*(xt|de|me)$)\w*$/
+
+## Homework 5
+/^(?!\w*(trac))\w*$/