Dart SDK Spelling b, c, and d.

pkg/front_end/testcases/DeltaBlue.dart

 // Copyright 2011 Google Inc. All Rights Reserved.
 // Copyright 1996 John Maloney and Mario Wolczko
 //
 // This file is part of GNU Smalltalk.
 //
 // GNU Smalltalk is free software; you can redistribute it and/or modify it
 // under the terms of the GNU General Public License as published by the Free
 // Software Foundation; either version 2, or (at your option) any later version.
 //
 // GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
@@ skipping 130 matching lines @@
   }
 
   void destroyConstraint() {
     if (isSatisfied()) planner.incrementalRemove(this);
     removeFromGraph();
   }
 
   /**
    * Normal constraints are not input constraints.  An input constraint
    * is one that depends on external state, such as the mouse, the
-   * keybord, a clock, or some arbitraty piece of imperative code.
+   * keybord, a clock, or some arbitrary piece of imperative code.
    */
   bool isInput() => false;
 }
 
 /**
  * Abstract superclass for constraints having a single possible output variable.
  */
 abstract class UnaryConstraint extends Constraint {
   final Variable myOutput;
   bool satisfied = false;
@@ skipping 534 matching lines @@
   EditConstraint edit = new EditConstraint(v, PREFERRED);
   Plan plan = planner.extractPlanFromConstraints(<EditConstraint>[edit]);
   for (int i = 0; i < 10; i++) {
     v.value = newValue;
     plan.execute();
   }
   edit.destroyConstraint();
 }
 
 Planner planner;