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     1 import M3._  | 
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     2   | 
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     3 assert(nullable(ZERO) == false)  | 
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     4 assert(nullable(ONE) == true)  | 
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     5 assert(nullable(CHAR('a')) == false) | 
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     6 assert(nullable(ZERO | ONE) == true)  | 
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     7 assert(nullable(ZERO | CHAR('a')) == false) | 
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     8 assert(nullable(ONE ~  ONE) == true)  | 
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     9 assert(nullable(ONE ~ CHAR('a')) == false) | 
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    10 assert(nullable(STAR(ZERO)) == true)  | 
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    11 assert(nullable(ALTs(List(ONE, CHAR('a'), ZERO))) == true) | 
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    12 assert(nullable(SEQs(List(ONE, ALTs(List(ONE, CHAR('a'), ZERO)), STAR(ZERO)))) == true) | 
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    13   | 
     2   | 
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     3 def urbanmain() = { | 
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     4   import M3._  | 
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     5   | 
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     6   assert(nullable(ZERO) == false)  | 
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     7   assert(nullable(ONE) == true)  | 
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     8   assert(nullable(CHAR('a')) == false) | 
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     9   assert(nullable(ZERO | ONE) == true)  | 
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    10   assert(nullable(ZERO | CHAR('a')) == false) | 
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    11   assert(nullable(ONE ~  ONE) == true)  | 
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    12   assert(nullable(ONE ~ CHAR('a')) == false) | 
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    13   assert(nullable(STAR(ZERO)) == true)  | 
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    14   assert(nullable(ALTs(List(ONE, CHAR('a'), ZERO))) == true) | 
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    15   assert(nullable(SEQs(List(ONE, ALTs(List(ONE, CHAR('a'), ZERO)), STAR(ZERO)))) == true) | 
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    16 }  |