equal
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  inserted
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|    118 fav_colour(Green) |    118 fav_colour(Green) | 
|    119  |    119  | 
|    120  |    120  | 
|    121 // actually colors can be written with "object", |    121 // actually colors can be written with "object", | 
|    122 // because they do not take any arguments |    122 // because they do not take any arguments | 
|         |    123  | 
|         |    124 abstract class Day | 
|         |    125 case object Monday extends Day  | 
|         |    126 case object Tuesday extends Day  | 
|         |    127 case object Wednesday extends Day | 
|         |    128 case object Thursday extends Day  | 
|         |    129 case object Friday extends Day  | 
|         |    130 case object Saturday extends Day | 
|         |    131 case object Sunday extends Day  | 
|         |    132  | 
|    123  |    133  | 
|    124  |    134  | 
|    125 // ... a bit more useful: Roman Numerals |    135 // ... a bit more useful: Roman Numerals | 
|    126  |    136  | 
|    127 abstract class RomanDigit  |    137 abstract class RomanDigit  |