One of the mysteries of the English language finally explained.
1‘they cycled along side by side’
alongside, alongside each other, beside each other, abreast, level, shoulder to shoulder, cheek by jowl, together, close together
2‘most transactions proceed side by side’
at the same time, at one and the same time, at the same instant, at the same moment, simultaneously, contemporaneously
together, all together, as a group
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