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From 1953 onwards , the pass road was sequentially improved and expanded at several sections along the Gotthard route , finally ending in 1977 with the opening of an expressway fully circumventing the Tremola .
 Gotthard, Tremola
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gotthard, Tremola