id	domain	url
stem-6661	dictionary.cambridge.org	https://dictionary.cambridge.org/dictionary/english/serious
stem-6661	dictionary.cambridge.org	https://dictionary.cambridge.org/dictionary/english/trouble
stem-6661	www.collinsdictionary.com	https://www.collinsdictionary.com/dictionary/english/avoid
stem-6661	www.collinsdictionary.com	https://www.collinsdictionary.com/dictionary/english/get
stem-6661	www.collinsdictionary.com	https://www.collinsdictionary.com/dictionary/english/difficulty
stem-6661	www.collinsdictionary.com	https://www.collinsdictionary.com/dictionary/english/especially