docs: public void pivot(final Sheet pivotSourceSheet, final Sheet pivotTargetSheet) {
  
          sourceSheet = pivotSourceSheet;
          targetSheet = pivotTargetSheet;
          annotations = new AnnotationList(new ArrayList<AnnotationTriplet>());
  
          getAnnotationsFromSource();
          setOffsets();
          validateAndAdaptSourceDataIfNeeded();
          defineSomeCellStyles();
          createEmptyHeaderRowsAndCells();
          fillInHeaderRows();
          pivotSourceRows();
          addSummations();
      }