[tag=NNS] [lemma=that] [□=□] □
[tag=NNS] [lemma=that] [tag=□] □
[tag=NNS] [lemma=that] [lemma=□] □
Then begins the hard work : examining tens of thousands of pollen grains under a microscope , counting them , and identifying the plant species that produced each one by comparing the grains with modern pollen from known plant species . In the Nineteenth century , one of the epochal events was the building of the web of railroads that interconnected each continent . " Most clips came from the live audience question-and-answer sessions that opened each program . A 1970s renovation closed off all but two of the original doorways that graced each side of the building . You do n't really have a full picture until you actually look at the individual cases and understand the individual circumstances that affected each decision to get a consent to search .