While linguistics traditionally keeps lexicon separate from grammar, Construction Grammar takes the grammatical construction as the basic unit of language. A grammatical construction integrates the roles of lexemes with their typical grammatical contexts, suggesting the advantages of a comprehensive approach. Furthermore, according to Construction Grammar, grammatical constructions comprise a system in which constructions mutually reinforce each other. We reveal the complex connections among Russian grammatical constructions that emerge from the Russian Constructicon, a resource with over 2200 annotated constructions. We achieve this by focusing on a single semantic subclass of 110 constructions labeled Sets and elements. Our analysis follows the connections among constructions through two domains: semantics and syntax. We find that all constructions fit into groupings at various levels of semantic schematicity, as well as presenting various syntactic dimensions. A given construction has affinities both to constructions with similar meanings and with similar form, and any given construction may have multiple affinities in either or both of these domains. Through our focus on multiword grammatical constructions, we reach beyond traditional approaches that separate words from grammar, instead viewing words in their grammatical context and grammar in its lexical context.