program p1118;
const
	MAXS=6;
	MAXK=40;
var
	str,line:string;
	word:array[1..MAXS] of string;
	i,p,k,s:integer;
	f:array[0..200,0..MAXK] of integer;

function min(a,b:integer):integer;
begin
	if a<=b then min:=a
	else min:=b;
end;
	
function work(str:string):integer;
var
	tot,i,j,ll:integer;
	st:string;
	used:array[1..200] of boolean;
	
begin
	tot:=0;
	fillchar(used,sizeof(used),false);
	
	for i:=1 to s do begin
		st:=str;
		ll:=0;
		j:=pos(word[i],st);
		while j<>0 do begin
			if not used[ll+j] then inc(tot);
			delete(st,1,j);
			used[ll+j]:=true;
			ll:=ll+j;
			j:=pos(word[i],st);
		end;
	end;
	work:=tot;
end;


procedure solve;
var
	i,j,ll,u:integer;
begin
	fillchar(f,sizeof(f),0);
	for i:=1 to 20*p do begin
		for j:=1 to min(i,k) do begin
			for u:=j-1 to i-1 do begin
				ll:=work(copy(str,u+1,i-u));
				if f[u,j-1]+ll>f[i,j] then
					f[i,j]:=f[u,j-1]+ll;
			end;
		end;
	end;
end;
	
begin
	readln(p,k);
	str:='';
	for i:=1 to p do begin
		readln(line);
		str:=str+line;
	end;
	readln(s);
	for i:=1 to s do
		readln(word[i]);
	solve;	
	writeln(f[20*p,k]);
	
end.