n = 100

function strategy(text)

  local lines = toLines(text)

  print("Lines found: " ..tostring(#lines))

  if #lines > n then

    local i1 = math.random(1, #lines-n)

    local i2 = i1+n

    print(table.concat(lines, "\n", i1, i2))

  end

end

function toLines(str)

  local t = {}

  local function helper(line) table.insert(t, line) return "" end

  helper((str:gsub("(.-)\r?\n", helper)))

  return t

end