pragma solidity ^0.7.0; import { DSMath } from "../../common/math.sol"; import { Basic } from "../../common/basic.sol"; import { CHIInterface } from "./interface.sol"; abstract contract Helpers is DSMath, Basic { CHIInterface constant internal chi = CHIInterface(0x0000000000004946c0e9F43F4Dee607b0eF1fA1c); }