function transferTokens (address _recipient) public {
    require(allocations[_recipient].amountClaimed < allocations[_recipient].totalAllocated);
    require(now >= allocations[_recipient].endCliff);
    require(now >= startTime);
    uint256 newAmountClaimed;
    if (allocations[_recipient].endVesting > now) {
      
      newAmountClaimed = allocations[_recipient].totalAllocated.mul(now.sub(startTime)).div(allocations[_recipient].endVesting.sub(startTime));
    } else {
      
      newAmountClaimed = allocations[_recipient].totalAllocated;
    }
    uint256 tokensToTransfer = newAmountClaimed.sub(allocations[_recipient].amountClaimed);
    allocations[_recipient].amountClaimed = newAmountClaimed;
    require(POLY.transfer(_recipient, tokensToTransfer));
    grandTotalClaimed = grandTotalClaimed.add(tokensToTransfer);
    LogPolyClaimed(_recipient, allocations[_recipient].AllocationSupply, tokensToTransfer, newAmountClaimed, grandTotalClaimed);
  }