{TAIL ~ Typical examples} of {HEAD ~ effective agents} are dimethylformamide; dimethylformamide and triethanolamine; N,N dimethylacetamide and N methyl pyrrolidone 
{ TAIL ~ Typical examples } of { HEAD ~ effective agents } are dimethylformamide ; dimethylformamide and triethanolamine ; N , N dimethylacetamide and N methyl pyrrolidone
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