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      1 #	@(#)context	8.6 (Berkeley) 10/14/94
      2 
      3 In historic vi, the previous context mark was always set:
      4 
      5 ex address:
      6     any number, <question-mark>, <slash>, <dollar-sign>,
      7     <single-quote>, <backslash>
      8 
      9 ex commands: undo, "z.", global, v
     10 
     11 vi commands: (, ), {, }, %, [[, ]], ^]
     12 
     13 nvi adds the vi command ^T to this list.
     14 
     15 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
     16 In historic vi, the previous context mark was set if the
     17 line changed:
     18 
     19 vi commands: '<mark>, G, H, L, M, z
     20 
     21 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
     22 In historic vi, the previous context mark was set if the
     23 line or column changed:
     24 
     25 vi commands: `<mark>, /, ?, N, n
     26 
     27 nvi adds the vi command ^A to this list.
     28 
     29 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
     30 In historic vi, the previous context mark was set in non-visual
     31 mode for ^R and ^L if the line changed, but I have yet to figure
     32 out how the line could change.
     33