static L tok_combineCurlyBrackets_keep(L tok) { new L l; for i over tok: { S t = tok.get(i); if (odd(i) && eq(t, "{")) { int j = findEndOfCurlyBracketPart(tok, i); l.add(joinSubList(tok, i, j)); i = j-1; } else l.add(t); } ret l; }