layers attributeIt consists of a list of layer intervals separated by any collection of characters from the layerlistsep attribute. Each layer interval is specified as either a layerId or a layerIdslayerId, where layerId = "all", a decimal integer or a layer name. (An integer i corresponds to layer i, layers being numbered from 1.)
The string s consists of 1 or more separator characters specified by the layersep attribute.
Thus, assuming the default values for layersep and layerlistsep, if layers="a:b:c:d:e:f:g:h", the layerRange string layers="a:b,d,f:all" would denote the layers a b d f g h.
layerRange is a valid type for:
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https://www.graphviz.org/docs/attr-types/layerRange/