**Four true facts:**

$123456789$ is divisible by 3.

$12345+6789$ is divisible by 3.

$123+456+789$ is divisible by 3.

$12+3456+78+9$ is divisible by 3.

**True or False?**

No matter where and how many $+$ signs you put in between the digits of the number 123456789, the resulting number is still divisible by 3.

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