Verify the chronological origins of the following specific directives within Part IV of the Constitution:
1. The mandate to provide free legal aid to impoverished citizens was inserted into the text via a subsequent constitutional amendment.
2. The directive aiming to prevent the dangerous concentration of wealth and means of production was inserted into the text via a subsequent constitutional amendment.
3. The provision securing just and humane conditions of work and maternity relief was part of the original, unamended constitutional text.