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Alonzo Church 1934 describes the construction of " formulas " ( again : sequences of symbols ) as written in his λ-calculus by use of a recursive description of how to start a formula and then build on the starting-symbol using concatenation and substitution .
 Alonzo Church
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Alonzo Church