↓こういうことでしょうか?
function myFunction(range) {
var result = [], previous = ""
for (let c in range) {
if (range[c][0] == "") break
if (previous.length == 0) {
result.push(range[c])
previous = range[c][0]
} else if (previous != range[c][0]) {
result.push([""])
result.push(range[c])
previous = range[c][0]
} else {
result.push([""])
}
}
return result
}
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