$17-$18/23-24:   Last temporary String Address

Kernal-Reference:

 CMP $17     : $B6DF
 STA $17     : $B6E7
 STX $17     : $B4EC

 BIT $18     : $F5A8 $F68C
 CPY $18     : $B6DB
 STA $18     : $E3F4

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