apple script to delete selected line numbers from text editor

I was having a huge sql script, From which I need to extract a small portion..... Cut / Paste seems to be a tough task this time... then I tried to write a small but powerful script & YES! this worked and made this task very easy & quick.... :)

tell application "TextWrangler"
 tell window 1
  set a to 1
  set b to 4330
  select (lines a through b)
  delete the selection
 end tell
end tell