anchor.diff:                      createArmNameRow(0, newIdx, true),
                       createArmNameRow(1, newIdx, true),
                       Builder.node('div', {className:'row submit', id:'arms-' + newIdx + '-group-buttons'}, [
  -                        Builder.node('input', {type:'button', id:'del-arm-button-' + newIdx, value:'Remove last arm'}),
  +                        Builder.node('input', {type:'button', id:'add-arm-button-' + newIdx, value:'Add arm'}),
                           "\n",
  -                        Builder.node('input', {type:'button', id:'add-arm-button-' + newIdx, value:'Add arm'})
  +                        Builder.node('input', {type:'button', id:'del-arm-button-' + newIdx, value:'Remove last arm'})
                       ])
                   ])
               ]);
  
positive.code:     </div--%>
      <div class="row" id="form-submit-row">
          <div class="value submit">
              <input type="button" id="add-epoch-button" value="Add Epoch"/>
              <input type="button" id="del-epoch-button" value="Remove last epoch"/>
              <input type="submit" class="submit" value="Create"/>
          </div>
  
negative.code:         }
  
          function delLastArmName(epochIndex) {
              delLastItem('#arms-' + epochIndex +'-group .added-arm', function() { controlLastArmDelButton(epochIndex) })
          }
  
          function controlLastEpochDelButton() {
  