code: public static Pattern modifierConv()
  	{
  		Pattern p = new Pattern(EntityReference.class, "ER");
  		p.add(erToPE(), "ER", "SPE");
  		p.add(linkToComplex(), "SPE", "PE");
  		p.add(participatesInConv(), "PE", "Conversion");
  		return p;
  	}
docs: Pattern for finding Conversions that an EntityReference is participating.
  @return the pattern