c auto comments

the following are the comments and formatoptions

comments=sO:* -,mO:* ,exO:*/,s1:/*,mb:*,ex:*/,://
formatoptions=croql


iab com /*<CR><CR>*/<Up>

when i type com, i was expecting

/*
*
*/

but i'm getting

/*
*
* */

how to fix this.

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