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fibs = 0:1:zipWith (+) fibs (tail fibs)
fib = (fibs !!)
 
main =  let 
                a = [fib 250000..] 
                b = a!!0
                c = 1
        in b `seq` print c

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data (,) a b = (,) a b
    deriving Generic
data (,,) a b c = (,,) a b c
    deriving Generic
data (,,,) a b c d = (,,,) a b c d
    deriving Generic
.......
data (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u v w x y z a_ b_ c_ d_ e_ f_ g_ h_ i_ j_ k_ l_ m_ n_ o_ p_ q_ r_ s_ t_ u_ v_ w_ x_ y_ z_ a__ b__ c__ d__ e__ f__ g__ h__ i__ j__
 = (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u v w x y z a_ b_ c_ d_ e_ f_ g_ h_ i_ j_ k_ l_ m_ n_ o_ p_ q_ r_ s_ t_ u_ v_ w_ x_ y_ z_ a__ b__ c__ d__ e__ f__ g__ h__ i__ j__
    -- deriving Generic
{- Manuel says: Including one more declaration gives a segmentation fault.

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-- | The unit datatype @()@ has one non-undefined member, the nullary
-- constructor @()@.
data () = () deriving Generic

data (,) a b = (,) a b
. . .
data (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u v w x y z a_ b_ c_ d_ e_ f_ g_ h_ i_ j_ k_ l_ m_ n_ o_ p_ q_ r_ s_ t_ u_ v_ w_ x_ y_ z_ a__ b__ c__ d__ e__ f__ g__ h__ i__ j__
 = (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,) a b c d e f g h i j k l m n o p q r s t u v w x y z a_ b_ c_ d_ e_ f_ g_ h_ i_ j_ k_ l_ m_ n_ o_ p_ q_ r_ s_ t_ u_ v_ w_ x_ y_ z_ a__ b__ c__ d__ e__ f__ g__ h__ i__ j__
    -- deriving Generic
{- Manuel says: Including one more declaration gives a segmentation fault.
. . .

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chislo :: String -> Bool
chislo []=True
chislo (x:xs) =if (x=='1') then chislo xs
               else if (x=='2') then chislo xs
                 else if (x=='3') then chislo xs
                   else if (x=='4') then chislo xs
                     else if (x=='5') then chislo xs
                       else if (x=='6') then chislo xs
                         else if (x=='7') then chislo xs
                           else if (x=='8') then chislo xs
                             else if (x=='9') then chislo xs
                               else if (x=='0') then chislo xs
                                 else if (x=='.') then chislo xs
							 else False

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fac 1 = 1
fac n = fac (n-1) * n