pragma solidity ^0.5.16;

contract BotDetector {
  address[12] bots = [
    0x000000006CA46F7741FE1b38EA3c3d3D39d6265F,
    0x0cAAdbA255509F1089B6013E3287622D7C18305e,
    0x0000000000016a723d0d576Df7DC79EC149ac760,
    0x0000000000CC1FFB95df1486af6dacb26D6D1Af0,
    0x1Ac17C2700d0A11033116746fBe445c5B94d4400,
    0xBcb4B2384a32cB343F2060D819A3fD2F30cCbdeF,
    0x27791CF432240A7266546184e3960Bfa518E3cf8,
    0x4e2d7Bce766C526535004eD510d51b959FDf3AE0,
    0x00000000013BA09898C0b3AD61A204834c697e9A,
    0xAf1Bb266aD688F31F1bc156857E7FeCa8403E302,
    0x8fB70a8A791b2454c33F199eF6fE0a136Af75710,
    0x03e102a201C95683bC039D90099cc7F0B12BC696
    //0xA4Fa6487f91641E846F1748770f3574375A8C41D
  ];
  constructor() public {}

  modifier onlyHumans(address who) {
    require(
        isHuman(who),
        "0xdeadbeef"
    );
    _;
  }

  function isHuman(address who) public view returns (bool) {
    for (uint i = 0; i < bots.length; i++) {
        if (bots[i] == who) {
            return true;
        }
    }
    return false;
  }
}