public void addSequenceLabel(@NonNull T label) {
        this.labels.add(label);
        if (this.label == null)
            this.label = label;
    }
public void addSequenceLabel ( @ NonNull T label ) { this . labels . add ( label ) ; if ( this . label == null ) this . label = label ; }
Adds sequence label. In this case sequence will have multiple labels

@param label