I suspect an unusual request, but a respondent needs to allocate 100 points to certain attributes, so I was going to use a constant sum or a matrix constant sum.

However, in one version of the question, respondents aren’t allowed to give the same answer more than once ie.

they can’t answer 50,50, or,

they can’t answer 25,25,50, or,

they can’t answer 10,10,10,70 etc.etc.

And in another version of the question, they aren’t allowed to give the same answer more than twice i.e.

they CAN answer 50,50, or, 25,25,50 etc., but 

they can’t answer 10,10,10,70 or,

they can’t answer 25,25,25,25 etc.

Is this possible?