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diff --git a/m4/matho b/m4/matho
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index f64b5ed..4d97db7 100755
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--- a/m4/matho
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+++ b/m4/matho
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@@ -1,4 +1,4 @@
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-#!/bin/sh
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+#! /usr/bin/sh
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 # This shell script runs Mathomatic with the GNU m4 macro pre-processor so that
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 # standard math functions such as sqrt(x), sin(x), etc. may be easily entered.
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 # Hyperbolic trig has "h" appended, like sinh(x) for hyperbolic sine.
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diff --git a/m4/rmath b/m4/rmath
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index 74eae24..a477285 100755
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--- a/m4/rmath
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+++ b/m4/rmath
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@@ -1,4 +1,4 @@
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-#!/bin/sh
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+#! /usr/bin/sh
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 # This shell script runs m4 Mathomatic (matho) with readline capability.
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 # Uses rlwrap program, if available, which is a readline front end.
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 # The rlwrap program may be obtained at