Equal First Letter

The first letters of "fox" and "flypaper" are the same but the strings differ in their tails.

If the tails of two strings that start with the same letter were equal, then the two strings are equal. Here is that rule:

equals( x+X, y+Y ) = true  if x == y and equals( X, Y )

This means that if you see two strings that start with different characters, they the strings are not equal. For example,

equals( "bat", "radio" ) = false

In this example, x is the character 'b', X is the string "at", y is the character 'r', Y is the string "adio".