Logic behind Single-digit check character for SSCC

Summary:

Hi,

I want to know the logic behind the Check digit method if we select as SSCC. From where that 1 digit is bringing in Container Number(last Digit) as it changing in dynamic way.

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Version (include the version you are using, if applicable):

24B.06b

Code Snippet (add any code snippets that support your topic, if applicable):