Every Solidity file specifies in the header a version number of the format `pragma solidity (^)0.4.*`. The caret (`^`) before the version number implies an unlocked pragma, meaning that the compiler will use the specified version _and above_, hence the term "unlocked". - Version used: ['>=0.4.24<0.8.0', '>=0.6.0<0.8.0', '>=0.6.2<0.8.0', '^0.7.3'] - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/presets/ERC20PresetMinterPauserUpgradeable.sol#3) - >=0.4.24<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/proxy/Initializable.sol#4) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20BurnableUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20PausableUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol#3) - >=0.6.2<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/utils/EnumerableSetUpgradeable.sol#3) - >=0.6.0<0.8.0 (node_modules/@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol#3) - ^0.7.3 (contracts/InitializableV2.sol#3) - ^0.7.3 (contracts/Migrations.sol#3) - ^0.7.3 (contracts/claim/SuperRareTokenMerkleDrop.sol#3) - ^0.7.3 (contracts/erc20/SuperRareToken.sol#3) - ^0.7.3 (contracts/registry/Registry.sol#3)