list<int> a = sequence(1, 20);
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 

list<int> b = randseq(20);
28 27 5 17 44 6 9 40 15 26 49 35 15 48 13 27 25 25 9 6 

list<int> c = a and b;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 28 27 5 17 44 6 9 40 15 26 49 35 15 48 13 27 25 25 9 6 

list<int> d = map(inc, a);
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 

list<int> e = reverse(a);
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 

list<int> f = select(is_odd, a);
1 3 5 7 9 11 13 15 17 19 

int  red = a.reduce(plus, 0);
210
int second = a[2];
3
list<int> g = combine(plus, a, b);
29 29 8 21 49 12 16 48 24 36 60 47 28 62 28 43 42 43 28 26 

g.del(is_odd);
8 12 16 48 24 36 60 28 62 28 42 28 26 

b.sort(int_compare);
5 6 6 9 9 13 15 15 17 25 25 26 27 27 28 35 40 44 48 49 

list<int> h = merge(a, b, int_compare);
1 2 3 4 5 5 6 6 6 7 8 9 9 9 10 11 12 13 13 14 15 15 15 16 17 17 18 19 20 25 25 26 27 27 28 35 40 44 48 49 

h via iterator:
1, 2, 3, 4, 5, 5, 6, 6, 6, 7, 8, 9, 9, 9, 10, 11, 12, 13, 13, 14, 15, 15, 15, 16, 17, 17, 18, 19, 20, 25, 25, 26, 27, 27, 28, 35, 40, 44, 48, 49, 
1
4
9
16
36

done