Assertion: liaison | /r/HasProperty | l-series
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Source sentences:
text: For Class A students, Preliminary lasted four weeks and included 30 hours of dual and solo training on liaison (L-series) aircraft (e.g.: Piper Cub, various Taylorcraft and Stinson types), with particular emphasis on steep gliding descents, approaches and precision landings without power ("dead-stick" landings).