4017
S - A conduction through two pathways , the first with 2 / 1 block the second having 0 . 12 - 0 . 14 s longer conduction time and with occasional 2 / 1 block was proposed for the explanation of the alternating P - P interval and other electrocardiographic features seen .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 None