Basic Guidelines For English Spellings
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prefix
With; together; jointly; altogether.
‘combine’- ‘command’
- ‘collude’
Usage
Com- is used before b, m, p, also occasionally before vowels and f. The following variant forms occur: co- especially before vowels, h, and gn; col- before l; cor- before r; and con- before other consonants
Origin
From Latin cum ‘with’.
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