PREVIOUS PRECISION PRINTF
PREVIOUS ( -- )  
ansi 16.6.2.2037 <SEARCH-ORDER>
the invers of ALSO , does a DROP on the search ORDER of vocabularies. 
 order: vocn ... voc2 voc1 -- vocn ... voc2 
 example: ALSO PRIVATE-VOC DEFINTIONS (...do some...) PREVIOUS DEFINITIONS

reference: p4_previous in ../src/search.c:0180, export CO PREVIOUS