The model solutions for:
These files are encoded in a simple XML format used by the
relevant elements view.
The `optional bits' are alternative types or methods that are
equally as valid as those identified in the model solutions.
The distance profiles for the
developers, broken out (1) task by tool, and (2) by programmers by tool.
An `x' marks where a solution element was first seen, an `o'
where a solution element was first correctly identified, and a
`+' when a different file was viewed.