No, because and and etc are never used together. Etc already means "and the rest."
only if it is imperative and has a comma between the two words.
A comma is used to separate elements within a sentence, such as items in a list or clauses. A hyphen is used to join words together to create a compound word or to show a connection between words in a phrase.
The best guide is to put a comma when there is a short gap between the words when spoken.
If a sentence consists of two independent clauses with a comma between them, it is a comma splice. That is, the part before the comma can stand on its own as a sentence, and the part after the comma can also stand on its own as a sentence, then it is a comma splice. If there is no punctuation there instead of a comma, it is known as a run-on sentence.
There is nothing on Google about "aspirin coal." It is possible that you saw the words together on a list of ingredients, such as "aspirin, coal tar...etc." but there would have been a comma between "aspirin" and "coal tar," as they are two different things.
You ussualy put a comma before the conjuction. On rare evernts you put the comma after.
A comma splice is the attempt to join two independent clauses with a comma without a coordinating conjunction. For example, "She walked the dog last night, today she fed it."
Some rules about using a comma is to use it to separate words and words groups with a series of three or more. Another rule is to separate two adjectives when the word 'and' can be used in-between them. More rules on commas can be found online on the Grammer Book website.
A run-on sentence occurs when two independent clauses are connected without proper punctuation or conjunctions. A comma splice, on the other hand, happens when two independent clauses are incorrectly joined with a comma but without a coordinating conjunction. Both errors result in choppy or confusing sentences.
The comma typically comes before the conjunction "but" when it is used to connect two independent clauses. If "but" is used to connect two words or phrases within a single sentence, a comma is not necessary.
The comma is used to separate similar words. 2011 is a number and January is 'text'. Therefore no comma is needed. But you would want to use a comma to separate two numbers. Hence January 11, 2011.
A comma is typically used between a dependent clause and an independent clause in most cases. A semicolon can be used if the two clauses are closely related and the writer wishes to create a stronger connection between them.