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Some embodiments relate to a method for detecting the presence of one or more nucleic acids indicative of a health condition, tissue of origin, germ layer of origin or organ of origin in a mixture of nucleic acids comprising performing methylation analysis on a sample comprising a plurality of nucleic acids and determining whether the sample includes a plurality of methylation haplotype blocks indicative of the presence one or more nucleic acids indicative of a health condition, tissue of origin, germ layer of origin or organ of origin wherein the methylation haplotype blocks comprise a plurality of methylation sites for which the methylation status is coordinated.