DB<1> @a[3..5]=()
 
  DB<2> @b[3..5]=()
 
  DB<3> print scalar @a
6
  DB<4> print ( () = @a,@b )
 
  DB<5> @c= @a,@b
 
  DB<6> print scalar @c
6
  DB<7> @c=(@a,@b)
 
  DB<8> print scalar @c
12  
  DB<9> print ( () = (@a,@b) )
 
  DB<10> push @a,@b
 
  DB<11> print scalar @a
12
  DB<12> x @a
0  undef
1  undef
2  undef
3  undef
4  undef
5  undef
6  undef
7  undef
8  undef
9  undef
10  undef
11  undef