Add inv_FAC1_mantissa

strings/65D00AE664D006E663D002E66260

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+$65 + BNE $0A + INC $64 + BNE $06 + INC $63 + BNE $02 + INC $62 + RTS
+
+Incrementing a 32-bit integer at the well known position of the FAC1 mantissa in the zero page.

strings/BBA90085

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+fragment + LDA #$00 + STA fragment
+
+Fragments of clearing byte in zero page.

strings/D0034C09

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+BNE $03 + JMP fragment
+
+If zero do jump else not. Common long conditional branch idiom.