| Challenge I |
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| • | Large number of
patterns/rules |
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| – | number of
possible column combinations is extremely high |
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| • | Solution: Concept
of a closed pattern |
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| – | Patterns are
found in exactly the same set of rows are |
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| grouped together
and represented by their upper bound |
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| • | Example: the
following patterns are found in row 2,3 |
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| and 4 |
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| aeh |
| ae |
| ah |
| eh |
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| “a” however not part of |
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| the group |
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| e |
| h |
| lower bounds |