For multiple dichotomies you have one variable for each possible thing that could be checked. Use mnemonic variable names like: color01 to color11 nocolor you could let blank be the value for not checked. Treat blank as zero unless all 12 are zero then transform them all to a missing value like 9. just go across and put 1's in color04 and color06. If the respondent saw the question, and didn't skip it, but did not check any put a 1 in nocolor. VALUE LABELS color01 to color11 nocolor 0 'not checked' 1 'checked' 9 'question not answered'.
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