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Use "decametre" in a sentence
"If you have a rope long enough, you can yourself make a decametre."
"In short (excuse the pun), for one reason or another users in the UK would be better served by a better dictionary of abbreviations than this; US users should be alerted to the fact that the text is British, unedited for American spelling: for ` decagramme, decalitre, decametre 'read ` decagram, decaliter, decameter.'"
"3. How many millimetres are there in a decametre [can also be spelt [or spelled] with a ‘k’]?"