<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ln_comment(self, ln):
 """Get an end line comment. CoconutInternalExceptions should always be caught and complained."""

        if self.keep_lines:
            if not 1 <= ln <= len(self.original_lines) + 1:
                raise CoconutInternalException(
                    "out of bounds line number", ln,
                    "not in range [1, " + str(len(self.original_lines) + 1) + "]",
                )
            elif ln == len(self.original_lines) + 1:  # trim too large
                lni = -1
            else:
                lni = ln - 1
        if self.line_numbers and self.keep_lines:
            if self.minify:
                comment = str(ln) + " " + self.original_lines[lni]
            else:
                comment = " line " + str(ln) + ": " + self.original_lines[lni]
        elif self.keep_lines:
            if self.minify:
                comment = self.original_lines[lni]
            else:
                comment = " " + self.original_lines[lni]
        elif self.line_numbers:
            if self.minify:
                comment = str(ln)
            else:
                comment = " line " + str(ln)
        else:
            return ""
        return self.wrap_comment(comment, reformat=False)