text: self.importScripts('tables.js', 'coordmoves.js')
  
  onmessage = function (event) {
      
      let allowedMoves = event.data[0];
      let targetState = event.data[1];
      let tablesFirst = event.data[2];
      let tablesSecond = event.data[3];
          
      let table = buildCombinedPruningTable(allowedMoves, targetState, tablesFirst, tablesSecond);
      
      postMessage ([table]);
          
  };