Apply rules to list of parent classes - less

Question

I have the below LESS stylesheet and I know there has to be a better way to organize this. Is the only option to create a map containing the classes and a mixin perhaps to repeat the styles?
// child div is injected by JS
.ddemrcontent > span, .blocksmarttemplate > span, .blocktoken > span {
display: inline-flex;
align-items: center;
min-height: 1.7rem;
margin-top: 0.2rem;
padding-left: 0.2rem;
}
.ddfreetext {
display: flex;
min-height: 1.7rem;
margin-top: 0.2rem;
}
.ddemrcontent > span:hover, .blocksmarttemplate > span:hover, .blocktoken > span:hover {
text-decoration: underline;
cursor: pointer;
}
.ddemrcontent > span {
border-left: 4px solid cadetblue;
}
.blocksmarttemplate > span {
border-left: 4px solid burlywood;
}
.blocktoken > span {
border-left: 4px solid #8a7090;
}
.ddfreetext {
border: 1px dashed black;
}
UPDATE
Here is the best I've been able to come up with. Since the & parent selector won't apply to each distinct parent selector (that are comma delimited) I think I am forced to use a mixin and call it to apply the rules for each parent I have.
Would love to hear if there's still a better way.
.dyndoccontent(#color) {
& > span {
display: inline-flex;
align-items: center;
min-height: 1.7rem;
margin-top: 0.2rem;
padding-left: 0.2rem;
border-left: 4px solid #color;
&:hover {
text-decoration: underline;
cursor: pointer;
}
}
}
// child div is injected by JS
.ddemrcontent {
.dyndoccontent(cadetblue);
}
.blocksmarttemplate {
.dyndoccontent(burlywood);
}
.blocktoken {
.dyndoccontent(#8a7090);
}
.ddfreetext {
display: flex;
min-height: 1.7rem;
margin-top: 0.2rem;
border: 1px dashed black;
}

Answer 1

I would definitely recommend mixin if you have multiple parts in your less files which use the same styles.
For you example i would go for a more nested way:
// child div is injected by JS
.ddemrcontent, .blocksmarttemplate, .blocktoken {
& > span {
display: inline-flex;
align-items: center;
min-height: 1.7rem;
margin-top: 0.2rem;
padding-left: 0.2rem;
&:hover {
text-decoration: underline;
cursor: pointer;
}
}
}
.ddfreetext {
border: 1px dashed black;
display: flex;
min-height: 1.7rem;
margin-top: 0.2rem;
}
.ddemrcontent > span {
border-left: 4px solid cadetblue;
}
.blocksmarttemplate > span {
border-left: 4px solid burlywood;
}
.blocktoken > span {
border-left: 4px solid #8a7090;
}