Write a program using if statements that reports the contents of a compressed-gas cylinder based on the first letter of the cylinder's color.
The program input is a character representing the observed color of the cylinder: 'Y' or 'y' for yellow, 'O' or 'o for orange, and so on.
Cylinder colors and their associated contents are as follows:
orange ammonia
brown carbon monoxide
yellow hydrogen
green oxygen

If an invalid letter is entered, notify the user of incorrect input by stating Contents Unknown.

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public class program {

    * @param args the command line arguments
    public static void main(String[] args) {
       // TODO code application logic here
       Scanner sc = new Scanner(;
       System.out.print("enter the character representing the observed color of the cylinder : ");...

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