[tag=VBG] [lemma=the] [lemma=selector] [□ | □]
[tag=VBG] [lemma=the] [lemma=selector] [□=□ | □]
[tag=VBG] [lemma=the] [lemma=selector] [□ & □ | □]
Select threads to read as usual , by typing the selector letters , which changes the corresponding - signs to + signs .