function getData() public view {
    uint length;
    for(uint i = 0; i<6; i++) {
        length += data[i].length;
    }
    bytes memory result = new bytes(length);

    uint index = 32; // bytes is an array, and in EVM the first
                     // 32 bytes of an array stores the length
                     // of the array, so add data 32 byte in

    for(i = 0; i < 6; i++) {
        bytes memory oneSixth = new bytes(data[i].length);
        oneSixth = data[i];
        assembly {
            mstore(add(result, index), add(oneSixth, 32))
        }
        index += data[i].length;
    }
}