Insect repellent -Countable or uncountable?

Insect repellent is a countable noun.
Here is the link with a lot of examples:
http://npic.orst.edu/ingred/ptype/repel.html

Word family: correct

• correctly
• correctness
• incorrect
• correction
• incorrectly
• corrective

Word family: defend

• defence
• defenceless
• defensive
• defensively
• defensible
• defender
• defendant

Build your vocabulary: walk

• march
• shuffle
• stagger
• step
• stride
• stroll
• tiptoe
• trudge

Do you know the plural form for papyrus?

It is papyri.)))
Please also check the pronunciation of the word papyrus.

What is the difference between CE and AD?

There is no difference in dating, just in the terms and who uses them. Anno Domini is Latin for "in the year of the Lord" referring to the birth of Jesus. C.E., the abbreviation for "Common Era" is used by Jews and other non-Christians to refer to the same system of reckoning, which has become the basis for the civil date in much of the world. In the same way, B.C.E. "Before the Common Era" substitutes B.C. "before Christ."

Transitional signals: Do you know these ones?

Good evening,my dear English learners!
Can you guess the meaning of those transition signals?
1. To these ends
2. By  the same token
Post your answers in comments below.