simplify XPath expression

hi,
i was thinking the following xpath could be simplified as it has 
redundant infos. but somehow i cannot bring this to work:

combilist/item/head[1][not(../date)]
[not(../image) and count(../description)=1]                                     
|
combilist/item/head[2][not(../price)]
[not(../image) and count(../description)=1]


the second line in each member of the above union is the same so i think 
it must be possible to combine these. i tried
(
        combilist/item/head[1][not(../date)]
        |
        combilist/item/head[2][not(../price)]
)
[not(../image) and count(../description)=1]

but this does not work...


thanks for any suggestions.
chris


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