Question: syntax/c.vim: cNumbers -> cNumber containment

Hi,
I am looking into .vim/syntax/c.vim and especially on cNumbers match rules.
This c syntax rules states that
cNumbers matches only the first single digit of integer number (\>\d),
while it "contains" cNumber which can contain multiple digits ( /\d\+/ ).

What is the purpose of 'cNumbers' rule here??

Thanks in advance.
----------------------------------------------------------------------------

"integer number, or floating point number without a dot and with "f".
syn case ignore
syn match cNumbers display transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctalError,cOctal
" Same, but without octal error (for comments)
syn match cNumbersCom display contained transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctal
syn match cNumber display contained "\d\+\(u\=l\{0,2}\|ll\=u\)\>"

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