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diff --git a/libjbig/jbig.c b/libjbig/jbig.c
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index 751ceff..3c76e07 100644
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--- a/libjbig/jbig.c
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+++ b/libjbig/jbig.c
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@@ -889,7 +889,7 @@ void jbg_enc_options(struct jbg_enc_state *s, int order, int options,
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   if (order >= 0 && order <= 0x0f) s->order = order;
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   if (options >= 0) s->options = options;
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   if (l0 > 0) s->l0 = l0;
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-  if (mx >= 0 && my < 128) s->mx = mx;
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+  if (mx >= 0 && mx < 128) s->mx = mx;
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   if (my >= 0 && my < 256) s->my = my;
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   return;
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diff --git a/pbmtools/Makefile b/pbmtools/Makefile
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index 85e1783..6ae2d33 100644
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--- a/pbmtools/Makefile
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+++ b/pbmtools/Makefile
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@@ -56,9 +56,9 @@ test82: pbmtojbg jbgtopbm
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 	make IMG=sandra    "OPTIONSP=-o 2" OPTIONSJ=       dotest2g
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 	make IMG=multi      OPTIONSP=      OPTIONSJ=       dotest2g
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 	make IMG=multi      OPTIONSP=-b    OPTIONSJ=-b     dotest2g
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-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest1
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-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128"       dotest2b
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-	make IMG=mx        "OPTIONSP=-q -s 3 -m 128 -p 92" dotest2b
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+	make IMG=mx        "OPTIONSP=-q -s 3 -m 127"       dotest1
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+	make IMG=mx        "OPTIONSP=-q -s 3 -m 127"       dotest2b
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+	make IMG=mx        "OPTIONSP=-q -s 3 -m 127 -p 92" dotest2b
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 	make IMG=mx        "OPTIONSP=-q -Y -1"             dotest2b
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 	make IMG=mx        "OPTIONSP=-Y -1"                dotest2b
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 	rm -f test-*.jbg test-*.pbm test-*.pgm