code: public String getAbbreviation(String abbr) 
      {
      	for(String abbreviation:abbrevations)
      	{
      		if(abbreviation.equalsIgnoreCase(abbr))
      		{
      			return abbreviation;
      		}
      	}
      	return null;
      	
      }
docs: /*if the anticodon contains abbreviation(amino acid) with different casing
  e.g.:FT                   /anticodon="(pos:3828893..3828895,aa:SeC)