[dʒʌdʒ] | judge | |
[dʒɪm] | gym, Jim | |
[dʒɛm] | gem |
The symbol [tʃ] appears to be an exception to the "one sound = one symbol" principle. We'll see later how it isn't really an exception. (For now, you can think of [tʃ] as a fancy single symbol that just happens to have a gap in the middle.)