src/linkProcessors/nextEnvProcessor.js
function rangeChain (id, sequence) {
    var first = getChainIndexById(id, sequence);
    return [first, lastChain(first, sequence)];
  }
function rangeChain (id, sequence) {
    var first = getChainIndexById(id, sequence);
    return [first, lastChain(first, sequence)];
  }
function rangeChain ( id , sequence ) { var first = getChainIndexById ( id , sequence ) ; return [ first , lastChain ( first , sequence ) ] ; }
Return tuple of chained indexes
@param   {Number}  id
@return  {Tuple}
Return tuple of chained indexes