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export const constants = { NULL_ADDRESS: '0x0000000000000000000000000000000000000000', ROPSTEN_NETWORK_ID: 3, KOVAN_NETWORK_ID: 42, TESTRPC_NETWORK_ID: 50, KOVAN_RPC_URL: 'https://kovan.infura.io/', ROPSTEN_RPC_URL: 'https://ropsten.infura.io/', ZRX_DECIMALS: 18, };