[Haskell-beginners] lists strange behaviour

[galeonet at tiscali.it]

Hello,
if I write down: [(x,y)|x<-[1..5],y<-[1..5]]
I obtain as expected:
[(1,1),(1,2),(1,3),(1,4),(1,5),(2,1),(2,2),(2,3),(2,4),(2,5),(3,1),(3,2),(3,3),(3,4),(3,5),(4,1),(4,2),(4,3),(4,4),(4,5),(5,1),(5,2),(5,3),(5,4),(5,5)]
If I write down: [(x,y)|x<-[1..5],y<-[1..5],x==5]
I obtain as expected:
[(1,1),(1,2),(1,3),(1,4),(1,5)]
but if I write: [(x,y)|x<-[1..5],y<-[1..5],x<-[1]]
I obtain:
[(1,1),(1,2),(1,3),(1,4),(1,5),(1,1),(1,2),(1,3),(1,4),(1,5),(1,1),(1,2),(1,3),(1,4),(1,5),(1,1),(1,2),(1,3),(1,4),(1,5),(1,1),(1,2),(1,3),(1,4),(1,5)]
Why?????
Thank you in advance.
Regards,
Maurizio


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