31      23      15      7      0CAR: XXXXXXXXXXXXXXXXXXXXXXXENNTTTTAMCDR: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX M: marked by GCA: atom  1: atom  0: pairTTTT: atom type  0000: Symbol		cdr: pointer to c-string  0001: Char		cdr: unicode codepoint  0010: Vector		car: num elements; cdr: pointer to first elementx 0011: Lambda		cdr: (params (expression ...) env)  0100: Prim		cdr: pointer to c-function  0101: Number		N: number type; E: exactness; cdr: number  0110: String		car: length; cdr: pointer to c-string  0111: Port		car: fd  1000: Special  1001: Free Vector  init: 	() Special constants:  empty		()  true		#t  false		#f - block of 1024 objects- growing array of pointers to blocks- freelist