How to make dashed lines between adjacent polygons render correctly in QGIS?

[المشرف العام]

I have adjacent polygons that I want to be marked out with dashed or dotted lines. This sometimes works but there appears to be a problem where the pattern isn't always synchronised on the shared boundaries which leads to odd patterns or solid lines. Is there a simple way round this?

Using GQIS 2.10.1 Pisa



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