Can I say "by order" instead of "in order"?
"By order" and "in order" actually mean different things. "By order" is usually used in the legal sense, like when a court or other authority gives instructions or commands. Ex: The stores were closed during the pandemic by government order. Ex: A curfew was enacted by court order. "In order" is most appropriate for this context, as it refers to a sequenced arrangement (order). If you want to indicate that a multitude of things are arranged in sequence, you should use "in order." Ex: These books are categorized in alphabetical order. Ex: These books go by number order.
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