code: public static boolean equalLengthSequences(ProteinSequence[] sequences) {
  
  		for (int i=0; i<sequences.length-1; i++) {
  			if (sequences[i]==null)
  				continue;
  			for (int j=i+1; j<sequences.length; j++) {
  				if (sequences[j]==null)
  					continue;
  				if (sequences[i].getLength() == sequences[j].getLength())
  					return true;
  			}
  		}
  		return false;
  	}
docs: A method to check whether an array of sequences contains at least two sequences having an equal length.
  
  @param sequences the array of {@link org.biojava.nbio.core.sequence.ProteinSequence} sequences
  @return true if any two sequences are of an equal length