alternating patterns

[doranchak]

What function word would be naturally repeated with itself? I can think only of repetitions across the border of a sentence, like: "Where do they come from? From the forest they come."

I scanned a sample corpus and found some examples.

It often happens around hyphens:

"He was alone—alone with these countless, these unheard-of treasures!"
"...sailing with a fair breeze, south-south-west after a week’s calm..."
"Oh, indeed—indeed, sir, he is innocent!"

Similar repetitions for emphasis:

"...gone on for a long long time"
"indeed, my dear dear Handel"
"a great many many years"

Interesting example involving homonyms:

"the will will not bear scrutiny, and is declared null and void"

Sounds:

"and 'boom boom' came the sounds"
"'Trakh ta ta takh' came the frequent crackle of musketry"
"'dam dam' rattled the drums"
"'Ha ha ha' laughed Pierre"

Other examples:

"...he had had a great many Frenchmen in his house"
"I assure you you are mistaken."
"that her being there may teach her her own insignificance."
"All it is is 2 coats"
"Things as they are are things as perceived by your mind"
"We'll split fifty fifty."
"Rainsford had dug himself in in France"
"The policemen trooped in in force"
"Javert had not taken the prisoner prisoner"
"What is is natural"
"but there are very few who do do their best"
"For they that sleep sleep in the night"
"and every man that offered offered an offering of gold" 
"they of Israel were a thousand thousand and an hundred thousand men"
"To have respect of persons is not good: for for a piece of bread that man will transgress"
"do I purpose according to the flesh, that with me there should be yea yea, and nay nay?"
"As well might poison poison!"
"Thy own wish wish I thee in every place"
"Dost thou teach pardon pardon to destroy?"
"Most lamentable day, most woful day. That ever ever I did yet behold!"
"very wittily said to niece of King Gorboduc 'That that is is'"
"But what remains remains for singers"
"but here and there there were dark underminings"
"His right hand once more more slowly went over his brow and hair"
"Love loves to love love"
"Yum yum!"
"praising on both sides what what neither of us can help"

Some I thought of:  
"His father's father's brother."
"The ball that rolls rolls swiftly."
"It is a very plum plum"  (I recalled that from the English Patient)
"If you see it it will see you."

Then there are of course the novelty examples of linguistic ambiguities:
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"Rose rose to put rose roes on her rows of roses"
"If police police..."
"Between 'and' and 'and'"