Broad brush painting is quicker. And if one is not at hand? In this case, it will help out the spark of two narrow. If the workload is small — they can simply attach sideways to each other with tape. For long work better to seal them together using thin strips (for example, a school ruler), as shown in the figure.
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It is known that if two are going to swap, say, apples, then in the end they will still be an Apple. Well, if these two will exchange ideas, then each will have two ideas... This idea...