Then they claim that "To be valid, a hypothesis must be testable by experimentation";
(they; claim; that "To be valid, a hypothesis must be testable by experimentation; T:Then) Context(they claim,List([5, 15))):(a hypothesis; must be; testable by experimentation)
they claim,List([5, 15))
they a hypothesis
claim must be
that "To be valid, a hypothesis must be testable by experimentation T:Then
testable by experimentation