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Likewise , Stanislav Grof suggested that painful and difficult experiences during a trip could be a result of the mind reliving experiences associated with birth , and that experiences of imprisonment , eschatological terror , or suffering far beyond anything imaginable in a normal state , if seen through to conclusion , often resolve into emotional , intellectual and spiritual breakthroughs .
 Stanislav Grof
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:
 Stanislav Grof