pack package [1] [2] [3] par [1] [2] [3] parameter array cl [1] [2] cursor file [1] [2] image list structured pset standard vector parameters set parentheses [1] [2] pattern matching percent percent character physical task pixel list plio plotting pointer [1] [2] [3] [4] precedence data type operator preprocessor [1] [2] generic [1] [2] printf procedure argument [1] [2] process program pset [1] [2] pushback