### Question:
And extends LTLFormula { @Override public LTLFormula copy() { ArrayList<LTLFormula> copiedChildren = new ArrayList<LTLFormula>(children.size()); for(LTLFormula child : children){ copiedChildren.add(child.copy()); } return new And(copiedChildren); } And(ArrayList<LTLFormula> children); @Override LTLType getLTLType(); @Override LTLFormula copy(); @Override LinkedHashSet<LinkedHashSet<LTLFormula>> toSetForm(); @Override ATransition d(HashMap<LTLFormula, ATransition> D); static void main(String args[]);  }### Answer:
@Test public void testCopy() { assertEquals(a_and_b, a_and_b.copy()); assertEquals(a_and_c, a_and_c.copy()); }