Architectural and engineering-type work. An architect who designs a building has moral rights to the design of that building. We are obliged to go back to that architect if we wish to make modifications to the look and feel of that building. That's one particular area.
There's a lot of software. If you try to change Microsoft's code, you're not going to do it unless you go back to Microsoft. There are a lot of issues in the telecom industry, in the software industry, and things that we're doing in space right now with our colleagues south of the border through the Canadian Space Agency. So there are a number of areas where we have a sole-source requirement.