Sentence:  Under P. L. 113 , <WSD>78</WSD> th Congress , the Federal Government assumed responsibility for 100 % of necessary State expenditures in connection with administration and the counseling and placement of the disabled , and for 50 % of the necessary costs of providing clients with rehabilitation case services . 
Meaning of the word marked with <WSD> tags:  any number of entities (members) considered as a unit