For the following Python problems please add some explanations to them if possible. The questions have multiple parts that go along with it. Please read them all before answering them.

(a) Write a Python function that takes as input a list of sentences and returns as output a list of sentences that satisfies a condition, which is also an input parameter.

def select_sentences(sentences, condition):

...

...

(b) Use the function select_sentences you defined to select all sentences that has two specific words. You may use any text such as a news article, etc. Define the necessary conditions for the following:

# 1. Write code that defines the necessary condition for this problem here

# 2. Write code that uses this condition to select the sentences as described above.

# 3. Write code to print out these selected sentences

(c) Describe the running time equation of the condition function above. Describe the running time equation of the select_sentences function above.

(d) Write a Python function that selects sentences that have one of the top-15 most-frequent words in the text. Make sure you disregard "stopwords" such as 'to', 'the', 'a', 'in', 'of', 'and', 'on', 'this', 'that', 'than', 'is', etc.

def select_important_sentences(text):

...

...