Boundary Sets
S: {<Sunny, Warm, ?, Strong, ?, ?>}
G: {<Sunny, ?, ?, ?, ?, ?>, <?, Warm, ?, ?, ?, ?>}
<Sunny, ?, ?, Strong, ?, ?>
<?, Warm, ?, Strong, ?, ?>
<Sunny, Warm, ?, ?, ?, ?>
No Need to represent contents of version space ---
Just represent the boundaries