<prompt> N-3 TNM staging of head and neck tumors shows:Metastasis in lymph nodes 2 cmMetastasis in lymph nodes 5 cmMetastasis in a lymph node 6 cmNone  <response>: 8th AJCC 2017 TNM Classification of Carcinoma Lip Oral Cavity Primary Tumor T Regional Lymph Nodes N Tis Carcinoma in situ. N1 Metastasis in a single ipsilateral LN, 3 cm in greatest dimension without extranodal extension T1 Tumor 2cm in greatest dimension 5cm depth of invasion N2a Metastasis in a single ipsilateral LN, 3 cm but 6 cm in greatest dimension without extranodal extension T2 Tumor 2cm in greatest dimension 5 mm but 10 mm depth of invasion or tumor 2 cm but 4 cm in greatest dimension depth of invation 10 mm N2b Metastaes in a multiple ipsilateral LN, none 6 cm in greatest dimension without extranodal extension T3 Tumor 4 cm in greastest dimension and 10 mm depth of invasion N2c Metastases in bilateral or contralateral LN, none 6cm in greatest dimension without extranodal extension T4a Lip: Tumor invades through coical bone, inferior alveolar nerve, floor of mouth, or skin of chin or nose N3a Metastasis in a LN 6cm in greatest dimension without extranodal extension N3b Metastasis in a single or multiple LNs with clinical extranodal extension Oral cavity: Tumor invades through coical bone mandible or maxillary sinus or invades the skin of face Distant Metastasis T4b Tumor invades masticator space, pterygoid plates, or skull base andor encases internal carotid aery M0 No distant metastasis. M1 Distant metastasis. 