2 added 255 characters in body
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"Put" is the past participle of "Put". You can understand the line as

If they are put together ...

There is a modifying participle phrase. Compare:

Eaten quickly, burgers are.. delicious.

The sentence still needs a grammatical subject, and a participle phrase cannot be a subject. In my example, "burgers" is the subject. In your example, the quote is the grammatical subject. A participle isn't a noun phrase, but a quote can be.

"Put" is the past participle of "Put". You can understand the line as

If they are put together ...

There is a modifying participle phrase. Compare:

Eaten quickly, burgers are...

"Put" is the past participle of "Put". You can understand the line as

If they are put together ...

There is a modifying participle phrase. Compare:

Eaten quickly, burgers are delicious.

The sentence still needs a grammatical subject, and a participle phrase cannot be a subject. In my example, "burgers" is the subject. In your example, the quote is the grammatical subject. A participle isn't a noun phrase, but a quote can be.

1
source | link

"Put" is the past participle of "Put". You can understand the line as

If they are put together ...

There is a modifying participle phrase. Compare:

Eaten quickly, burgers are...