Selection: age=young
['young', 'myope', 'no', 'reduced', 'none']
['young', 'myope', 'no', 'normal', 'soft']
['young', 'myope', 'yes', 'reduced', 'none']
['young', 'myope', 'yes', 'normal', 'hard']
['young', 'hypermetrope', 'no', 'reduced', 'none']
['young', 'hypermetrope', 'no', 'normal', 'soft']
['young', 'hypermetrope', 'yes', 'reduced', 'none']
['young', 'hypermetrope', 'yes', 'normal', 'hard']

Selection: age=young or presbyopic, astigmatic=yes
['young', 'myope', 'yes', 'reduced', 'none']
['young', 'myope', 'yes', 'normal', 'hard']
['young', 'hypermetrope', 'yes', 'reduced', 'none']
['young', 'hypermetrope', 'yes', 'normal', 'hard']
['presbyopic', 'myope', 'yes', 'reduced', 'none']
['presbyopic', 'myope', 'yes', 'normal', 'hard']
['presbyopic', 'hypermetrope', 'yes', 'reduced', 'none']
['presbyopic', 'hypermetrope', 'yes', 'normal', 'none']

Selection: NOT age=young, astigmatic=yes
['young', 'myope', 'no', 'reduced', 'none']
['young', 'myope', 'no', 'normal', 'soft']
['young', 'hypermetrope', 'no', 'reduced', 'none']
['young', 'hypermetrope', 'no', 'normal', 'soft']
['pre-presbyopic', 'myope', 'no', 'reduced', 'none']
['pre-presbyopic', 'myope', 'no', 'normal', 'soft']
['pre-presbyopic', 'myope', 'yes', 'reduced', 'none']
['pre-presbyopic', 'myope', 'yes', 'normal', 'hard']
['pre-presbyopic', 'hypermetrope', 'no', 'reduced', 'none']
['pre-presbyopic', 'hypermetrope', 'no', 'normal', 'soft']
['pre-presbyopic', 'hypermetrope', 'yes', 'reduced', 'none']
['pre-presbyopic', 'hypermetrope', 'yes', 'normal', 'none']
['presbyopic', 'myope', 'no', 'reduced', 'none']
['presbyopic', 'myope', 'no', 'normal', 'none']
['presbyopic', 'myope', 'yes', 'reduced', 'none']
['presbyopic', 'myope', 'yes', 'normal', 'hard']
['presbyopic', 'hypermetrope', 'no', 'reduced', 'none']
['presbyopic', 'hypermetrope', 'no', 'normal', 'soft']
['presbyopic', 'hypermetrope', 'yes', 'reduced', 'none']
['presbyopic', 'hypermetrope', 'yes', 'normal', 'none']
