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/usr/share/sgml/entities/Hewlett-Packard/HPcalc is in sgml-data 2.0.6.

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 <!--
    -   (c) Copyright 1987-1993 Hewlett-Packard Company
    -
    -   Permission to use, copy, and distribute this Document Type
    -   Definition (DTD) is hereby granted, provided that the above
    -   copyright notice appear in all copies and that both that copyright
    -   notice and this permission notice appear in supporting hardcopy and
    -   online documentation.  All other rights reserved.
    -
    -   The name of Hewlett-Packard Company or the Hewlett-Packard logo may
    -   not be used in advertising or publicity pertaining to distribution
    -   of this DTD without specific, written prior permission.
    -   Hewlett-Packard Company makes no representations about the
    -   suitability of this DTD for any purpose.  It is provided "as is"
    -   without express or implied warranty.
    -
    -   Hewlett-Packard disclaims all warranties with regard to this DTD,
    -   including all implied warranties of merchantability and fitness, in
    -   no event shall Hewlett-Packard Company be liable for any special,
    -   indirect or consequential damages or any damages whatsoever
    -   resulting from loss of use, data or profits, whether in an action
    -   of contract, negligence or other tortious action, arising out of or
    -   in connection with the use or performance of this DTD.
    -->

<!-- Character entity set. Typical invocation:
     <!ENTITY % HPcalc PUBLIC "-//Hewlett-Packard//ENTITIES Calculators//EN">
     %HPcalc;
-->

<!ENTITY P              SDATA "[P]" >
<!ENTITY S              SDATA "[S]" >
<!ENTITY UAE            SDATA "[UAE]" >
<!ENTITY UDelta         SDATA "[UDelta]" >
<!ENTITY UDstroke       SDATA "[UDstroke]" >
<!ENTITY UGamma         SDATA "[UGamma]" >
<!ENTITY UNbar          SDATA "[UNbar]" >
<!ENTITY UOmega         SDATA "[UOmega]" >
<!ENTITY UPhi           SDATA "[UPhi]" >
<!ENTITY UPi            SDATA "[UPi]" >
<!ENTITY USigma         SDATA "[USigma]" >
<!ENTITY UThorn         SDATA "[UThorn]" >
<!--  a.m.      -->
<!ENTITY aalpha         SDATA "[aalpha]" >
<!ENTITY ae             SDATA "[ae]" >
<!ENTITY alarm          SDATA "[alarm]" >
<!ENTITY algic          SDATA "[algic]" >
<!ENTITY algrc          SDATA "[algrc]" >
<!ENTITY alpha          SDATA "[alpha]" >
<!ENTITY alpic          SDATA "[alpic]" >
<!ENTITY alprc          SDATA "[alprc]" >
<!ENTITY angle          SDATA "[angle]" >
<!ENTITY attn           SDATA "[attn]" >
<!--  back      -->
<!ENTITY batt           SDATA "[batt]" >
<!ENTITY beta           SDATA "[beta]" >
<!ENTITY biglongleftarrow       SDATA "[biglongleftarrow]" >
<!ENTITY biglongrightarrow      SDATA "[biglongrightarrow]" >
<!ENTITY bullet         SDATA "[bullet]" >
<!ENTITY busy           SDATA "[busy]" >
<!ENTITY cdot           SDATA "[cdot]" >
<!--  cents     -->
<!ENTITY chi            SDATA "[chi]" >
<!--  copy      -->
<!ENTITY currency       SDATA "[currency]" >
<!ENTITY curs           SDATA "[curs]" >
<!--  date      -->
<!ENTITY dbldot         SDATA "[dbldot]" >
<!ENTITY dblellipsis            SDATA "[dblellipsis]" >
<!--  deg       -->
<!ENTITY delta          SDATA "[delta]" >
<!--  div       -->
<!--  down      -->
<!ENTITY downarrow      SDATA "[downarrow]" >
<!--  dquote    -->
<!ENTITY dstroke        SDATA "[dstroke]" >
<!--  ellipsis  -->
<!ENTITY emptyset       SDATA "[emptyset]" >
<!--  emdash    -->
<!--  endash    -->
<!ENTITY engnot         SDATA "[engnot]" >
<!ENTITY enter          SDATA "[enter]" >
<!ENTITY esc            SDATA "[esc]" >
<!ENTITY eta            SDATA "[eta]" >
<!ENTITY exch           SDATA "[exch]" >
<!ENTITY fardown        SDATA "[fardown]" >
<!ENTITY farleft        SDATA "[farleft]" >
<!ENTITY farright       SDATA "[farright]" >
<!ENTITY farup          SDATA "[farup]" >
<!ENTITY fcparen        SDATA "[fcparen]" >
<!ENTITY femord         SDATA "[femord]" >
<!ENTITY florin         SDATA "[florin]" >
<!ENTITY foparen        SDATA "[foparen]" >
<!ENTITY frclose        SDATA "[frclose]" >
<!ENTITY fropen         SDATA "[fropen]" >
<!ENTITY gamma          SDATA "[gamma]" >
<!--  geq       -->
<!ENTITY gtlt           SDATA "[gtlt]" >
<!ENTITY half           SDATA "[half]" >
<!--  halfspace -->
<!--  home      -->
<!ENTITY hookleftarrow  SDATA "[hookleftarrow]" >
<!ENTITY immic          SDATA "[immic]" >
<!ENTITY infty          SDATA "[infty]" >
<!ENTITY inlshf         SDATA "[inlshf]" >
<!ENTITY inrshf         SDATA "[inrshf]" >
<!ENTITY int            SDATA "[int]" >
<!ENTITY intllrarrows   SDATA "[intllrarrows]" >
<!ENTITY intxy          SDATA "[intxy]" >
<!ENTITY lambda         SDATA "[lambda]" >
<!--  left      -->
<!ENTITY leftarrow      SDATA "[leftarrow]" >
<!ENTITY leftrightarrow SDATA "[leftrightarrow]" >
<!--  leq       -->
<!ENTITY lf             SDATA "[lf]" >
<!ENTITY lira           SDATA "[lira]" >
<!ENTITY lshf           SDATA "[lshf]" >
<!ENTITY mascord        SDATA "[mascord]" >
<!ENTITY menuptr        SDATA "[menuptr]" >
<!--  micro     -->
<!ENTITY mid            SDATA "[mid]" >
<!--  minus     -->
<!--  minutes   -->
<!ENTITY mu             SDATA "[mu]" >
<!ENTITY nabla          SDATA "[nabla]" >
<!ENTITY nbar           SDATA "[nbar]" >
<!ENTITY neg            SDATA "[neg]" >
<!--  neq       -->
<!ENTITY not-eq         SDATA "[not-eq]" >
<!ENTITY nwarrow        SDATA "[nwarrow]" >
<!ENTITY ocrossbar      SDATA "[ocrossbar]" >
<!--  ohm       -->
<!ENTITY omega          SDATA "[omega]" >
<!ENTITY opsqr          SDATA "[opsqr]" >
<!ENTITY over           SDATA "[over]" >
<!--  p.m.      -->
<!ENTITY paper          SDATA "[paper]" >
<!ENTITY partial        SDATA "[partial]" >
<!--  pellipsis -->
<!ENTITY pi             SDATA "[pi]" >
<!--  pm        -->
<!ENTITY polishl        SDATA "[polishl]" >
<!ENTITY printer        SDATA "[printer]" >
<!ENTITY qtri           SDATA "[qtri]" >
<!ENTITY quarter        SDATA "[quarter]" >
<!--  reg SDAATA ""     -->
<!ENTITY return         SDATA "[return]" >
<!ENTITY rho            SDATA "[rho]" >
<!--   entity{right     -->
<!ENTITY rightarrow     SDATA "[rightarrow]" >
<!ENTITY rminus         SDATA "[rminus]" >
<!ENTITY rshf           SDATA "[rshf]" >
<!ENTITY scr-e          SDATA "[scr-e]" >
<!ENTITY scr-x          SDATA "[scr-x]" >
<!ENTITY scr-y          SDATA "[scr-y]" >
<!--  seconds   -->
<!ENTITY shift          SDATA "[shift]" >
<!ENTITY sigma          SDATA "[sigma]" >
<!--  sigspace  -->
<!ENTITY singleellipsis SDATA "[singleellipsis]" >
<!ENTITY speccapy       SDATA "[speccapy]" >
<!ENTITY speccolon      SDATA "[speccolon]" >
<!ENTITY specperiod     SDATA "[specperiod]" >
<!ENTITY squote     	SDATA "[squote]" >
<!--  sterling  -->
<!ENTITY stop           SDATA "[stop]" >
<!ENTITY surd           SDATA "[surd]" >
<!ENTITY surdx          SDATA "[surdx]" >
<!ENTITY tau            SDATA "[tau]" >
<!ENTITY theta          SDATA "[theta]" >
<!ENTITY thorn          SDATA "[thorn]" >
<!ENTITY threequarter   SDATA "[threequarter]" >
<!ENTITY tick           SDATA "[tick]" >
<!--  time      -->
<!--  times     -->
<!--  tm        -->
<!ENTITY trans          SDATA "[trans]" >
<!ENTITY udbackquest    SDATA "[udbackquest]" >
<!ENTITY udroll         SDATA "[udroll]" >
<!--  up        -->
<!ENTITY uparrow        SDATA "[uparrow]" >
<!ENTITY upshift        SDATA "[upshift]" >
<!ENTITY varepsilon     SDATA "[varepsilon]" >
<!--  vblank    -->
<!ENTITY vdash          SDATA "[vdash]" >
<!--  vellipsis -->
<!ENTITY xbar           SDATA "[xbar]" >
<!ENTITY xhat           SDATA "[xhat]" >
<!ENTITY xsurdy         SDATA "[xsurdy]" >
<!ENTITY ybar           SDATA "[ybar]" >
<!ENTITY yen            SDATA "[yen]" >
<!ENTITY yhat           SDATA "[yhat]" >
         
<!--   CUSTOM Entities used by CVD/Calculator Tag       -->
<!ENTITY Q              SDATA "[Q]" >
<!ENTITY A              SDATA "[A]" >
<!ENTITY PEND           SDATA "[PEND]" >
<!ENTITY GRAD           SDATA "[GRAD]" >
<!ENTITY RAD            SDATA "[RAD]" >
<!ENTITY HEX            SDATA "[HEX]" >
<!ENTITY OCT            SDATA "[OCT]" >
<!ENTITY BIN            SDATA "[BIN]" >
<!ENTITY PRGM           SDATA "[PRGM]" >
<!ENTITY BEGIN          SDATA "[BEGIN]" >
<!ENTITY A..Z           SDATA "[A..Z]" >
<!ENTITY EQN            SDATA "[EQN]" >
<!ENTITY ann0           SDATA "[ann0]" >
<!ENTITY ann1           SDATA "[ann1]" >
<!ENTITY ann2           SDATA "[ann2]" >
<!ENTITY ann3           SDATA "[ann3]" >