Found the following hamletworks.org entries referring to line 2871

View Commentary Note for 2871
2871 Why thou art thus incenst, let him goe Gertrard.4.5.127

View Immaterial Textual Note for 2871
2871 Why thou art thus incenst, let him goe Gertrard.4.5.127

View Material Textual Note for 2871
2871 Why thou art thus incenst, let him goe Gertrard.4.5.127