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The root of fascination with pi is the fact that the ratio of the circle's two simplest measurable quantities – the distance around it and the distance across it – produces a number that is so complicated: its digital expansion continues for ever, churning out a sequence of digits with no apparent pattern.
PAA and PVA are the two simplest vinyl polymers containing CH2OH and OH lateral groups, respectively.
Among these combinations, right-angle distribution and homogeneous distribution, described in Fig. 2, are the two simplest and optimal arrangements.
Poly allyl alcohol), PAA, and poly vinyl alcohol), PVA, are the two simplest polymer containing hydroxymethyl and hydroxyl lateral groups, respectively.
We first consider the two simplest cooperative protocols: nonoverlapped AF where the relay amplifies the received signal and forwards it to the destination, and nonoverlapped DF with repetition coding where the relay decodes the message, reencodes it using the same codebook as the source, and forwards it.
The best-known compounds are the two simplest plumbane derivatives: tetramethyllead (TML) and tetraethyllead (TEL).
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Two simple words.
There are two simple answers.
Two simple words: peer pressure.
There are two simple reasons for this.
The Gettysburg Address contains two simple truths.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com