Multiple Signature Block on the same document for just one signer using SDK

private static void addSignatures(DocumentPackage retrievedPackage, String documentId, Map coord, String signerEmail) {
	
	for (Map.Entry entry : coord.entrySet()) {

		Signature signature = SignatureBuilder.signatureFor(signerEmail)
				.onPage(Integer.parseInt(entry.getKey()))
				.atPosition(entry.getValue().getX(), entry.getValue().getY())
				.build();
		
		String addedSignature = eslClient.getApprovalService().addSignature(retrievedPackage, documentId, signature);
		
	}
}

public class Coordinates {
	
    private int X;
    private int Y;

    public Coordinates() {
        this(0,0);
    }        
    public Coordinates(int X, int Y) {
        this.X = X;
        this.Y = Y;
    }
    public int getX() {
        return X;
    }
    public int getY() {
        return Y;
    }
    public void setX(int X) {
        this.X = X;
    }
    public void setY(int Y) {
        this.Y = Y;
    }
}