How to use the performs. function in performs

w["pearpkg2"]="272*2";
w["pecif"]="174*1";
w["pecifi"]="365*1";
w["pecl"]="147*1";
w["peer"]="402*1";
w["pem"]="147*1";
w["pendent"]="402*1";
w["peopl"]="42*3,354*2,520*3";
w["per"]="155*1,249*1,343*1";
w["perclass"]="23*1,151*1,422*2";
w["perfect"]="158*1";
w["perfo"]="404*1";
w["perform"]="15*1,26*1,42*2,58*1,60*1,76*4,91*1,99*1,108*1,111*1,137*1,164*1,174*2,201*1,204*1,241*2,249*1,256*1,263*1,328*1,337*1,338*1,386*1,399*2,404*1,478*1,521*1";
w["perform."]="237*1";
w["perform:"]="15*1";
w["performs."]="404*1";
w["period"]="103*1,238*1";
w["perl"]="506*1";
w["perl-compat"]="506*1";
w["perm"]="42*1";
w["perman"]="402*3";
w["permeabl"]="329*1";
w["permethod"]="23*1,151*1,422*2";
w["permiss"]="42*5,104*1,402*7,403*1,445*2";
w["permission."]="42*1,402*2";
w["permit"]="42*11,402*3";
w["permit."]="402*1";
w["perproject"]="23*1,151*1,422*2";
w["persist"]="288*9,381*1";
w["person"]="248*3,280*2,402*2";
w["persson"]="27*1,189*1";
w["pertin"]="42*1";