For this exercise, develop a function name 'decode (message_file)'. This function should read an encoded message from a .txt file and return its decoded version as a string. Your function must be able to process an input file with the following format: 1 love 2 computers 3 dogs 4 cats 5 I 6 you In this file, each line contains a number followed by a word. The task is to decode a hidden message based on the arrangement of these numbers into a 'pyramid' structure. \The numbers are placed into the pyramid in ascending order, with line of the pyramid having one more number than the line above it. The smallest number is 1, and the numbers increases consecutively. The key to decoding the message is to use the words corresponding to the numbers at the end of each pyramid line and return the message as a string 'I love computers