set b [list a b {c d e} {f {g h}}]
puts "Treated as a list: $b\n"
set b [split "a b {c d e} {f {g h}}"]
puts "Transformed by split: $b\n"
set a [concat a b {c d e} {f {g h}}]
puts "Concated: $a\n"
lappend a {ij K lm} ;# Note: {ij K lm} is a single element
puts "After lappending: $a\n"
set b [linsert $a 3 "1 2 3"] ;# "1 2 3" is a single element
puts "After linsert at position 3: $b\n"
set b [lreplace $b 3 5 "AA" "BB"]
puts "After lreplacing 3 positions with 2 values at position 3: $b\n"