use set literals instead of big disjunctions

java/ql/lib/semmle/code/java/frameworks/struts/StrutsConventions.qll

@@ -101,12 +101,7 @@ class Struts2ConventionActionClass extends Class {
     exists(string ancestorPackage |
       // Has an ancestor package on the whitelist
       ancestorPackage = this.getPackage().getName().splitAt(".") and
-      (
-        ancestorPackage = "struts" or
-        ancestorPackage = "struts2" or
-        ancestorPackage = "action" or
-        ancestorPackage = "actions"
-      )
+      ancestorPackage = ["struts", "struts2", "action", "actions"]
     ) and
     (
       this.getName().matches("%" + getConventionSuffix(this)) or

java/ql/src/Likely Bugs/Comparison/UselessComparisonTest.qll

@@ -7,12 +7,7 @@ import semmle.code.java.dataflow.SSA
  * The kind of bound that is known to hold for some variable.
  */
 library class BoundKind extends string {
-  BoundKind() {
-    this = "=" or
-    this = "!=" or
-    this = ">=" or
-    this = "<="
-  }
+  BoundKind() { this = ["=", "!=", ">=", "<="] }
 
   predicate isEqual() { this = "=" }